MontereyBreakwater
Breakwater San Carlos Beach
Monterey, Monterey Bay, California
Breakwater · Right now
Good
Waves at this site, 13 s swell:
- Great under ~1.5 ft
- Good to ~2.5 ft
- Fair to ~3.5 ft
- Rough to ~5 ft
- Severe above ~5 ft
Sheltered from most west swell. Local wind chop on the surface.
High confidence
High confidence: Based on a live buoy reading 30 min ago.
Updated 24 min ago
Buoy reading: 4:00 PM (54 min ago) at buoy 46236. Measured offshore waves; the current rating starts from it.
Forecast issued: Wed, Oct 14, 1:26 PM PDT. NWS wind and air forecast for this spot; later hours also use the wave model run named under Advanced.
Page data: refreshed every 30 minutes; last refresh Wed, Oct 14, 4:30 PM PDT.

Right now
- Waves
- 0.5ft Estimate
- Swell
- 3ft WNW · 13 sec
- Wind
- 10kt Cross-shore
- Tide
- 3.6ft Falling · 0.8 ft above predicted
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
All readings
- Swells: 3 ft, 13 s WNW · 3 ft, 7 s WNW · Wind 10 kt cross-shore
- Next low tide 8:15 PM (0.3 ft)
- Next high tide 3:37 AM (3.6 ft)
- Water temperature from the Monterey harbor tide station (NOAA 9413450); wind (including half the gust) and air from the NWS forecast for this hour.
Forecast limitations
The rating covers surge and entry conditions only.
- Visibility Plankton, runoff and water stirred up for days after big seas aren't in the rating. A "Vis likely poor" note only warns when a known cause is present; it never promises clear water.
- Depth On long-period days, surge on deeper reefs is stronger than at the entry.
- On the day Sets, kelp and currents vary; look at the water before you go in.
- Further out Accuracy drops the further out you look; days 6 and 7 are a rough guide.
Plan your dive
Today · Select a time
Day GoodAfter dark GoodWhy Good?
About 0.9 ft of local wind chop makes the surface swim rough.
Swells: 3 ft, 13 s WNW · 3 ft, 7 s WNW · Wind 10 kt cross-shore
Rated by the most challenging conditions in the rest of today's daytime, to 8 PM. After dark (8 PM to midnight) is shown as conditions, not as a dive window.
High confidence: Based on a live buoy reading from the last hour.
This window has passed.
This window has passed.
Sheltered from most west swell. Local wind chop on the surface.
- Waves
- 0.5ft Estimate
- Swell
- 3ft WNW · 13 sec
- Wind
- 10kt Cross-shore
- Tide
- 2.7ft
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
Roughest around 4:30 PM
High confidence
High confidence: Based on a live buoy reading 54 min ago.
Sunset 6:33 PMDark by 6:59 PMWaxing crescent, about 16% lit
Sheltered from most northwest swell. Forecasts this far out often clear up too fast.
- Waves
- 0.5ft Estimate
- Swell
- 2.5ft WNW · 13 sec
- Wind
- 5kt Light
- Tide
- 0.3ft
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
Low tide 8:15 PM (0.3 ft) · Roughest around 8 PM
High confidence
High confidence: This is a forecast about 4 hours ahead; recent forecasts have matched the buoy well.
Reduced visibility after dark; access rules still apply.
Sunset 6:33 PMDark by 6:59 PMWaxing crescent, about 16% lit
Thu, Oct 15 · Select a time
Day GoodAfter dark GoodWhy Good?
A modest northwest swell is mostly blocked by the Monterey Peninsula, so expect some surge near the wall.
Swells: 2 ft, 12 s WNW · 2 ft, 14 s SSW · 2 ft, 6 s WNW · Wind 8 kt cross-shore
Rated by the most challenging conditions from 7 AM to 8 PM. After dark (8 PM to midnight) is shown as conditions, not as a dive window.
Low confidence because the wave model is in its first week of calibration here; this forecast is about 25 hours ahead, though recent forecasts have matched the buoy well. Capped at Good because confidence is Low.
Sheltered from most northwest swell. A light 8 kt cross-onshore breeze on the surface.
- Waves
- 0.4ft Estimate
- Swell
- 2.3ft WNW · 12 sec
- Wind
- 8kt Cross-onshore
- Tide
- 3.3ft
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
Roughest around 7 AM
Medium confidence
Medium confidence because this forecast is about 15 hours ahead, though recent forecasts have matched the buoy well.
Sheltered from most northwest swell. A light 9 kt cross-onshore breeze on the surface.
- Waves
- 0.4ft Estimate
- Swell
- 2.3ft WNW · 12 sec
- Wind
- 9kt Cross-onshore
- Tide
- 4.9ft
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
High tide 1:10 PM (5.1 ft) · Roughest around 12 PM
Medium confidence
Medium confidence because this forecast is about 20 hours ahead, though recent forecasts have matched the buoy well.
Sheltered from most northwest swell. Some surge possible near the wall.
- Waves
- 0.5ft Estimate
- Swell
- 2.3ft WNW · 12 sec
- Wind
- 8kt Cross-shore
- Tide
- 2.9ft
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
Roughest around 5 PM
Low confidence
Low confidence because the wave model is in its first week of calibration here; this forecast is about 25 hours ahead, though recent forecasts have matched the buoy well. Capped at Good because confidence is Low.
Sunset 6:31 PMDark by 6:57 PMWaxing crescent, about 24% lit
Sheltered from most northwest swell. Some surge possible near the wall.
- Waves
- 0.5ft Estimate
- Swell
- 2.3ft WNW · 12 sec
- Wind
- 6kt Cross-onshore
- Tide
- 0.6ft
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
Low tide 9:11 PM (0.4 ft) · Roughest around 8 PM
Low confidence
Low confidence because the wave model is in its first week of calibration here; this forecast is about 28 hours ahead, though recent forecasts have matched the buoy well. Capped at Good because confidence is Low.
Reduced visibility after dark; access rules still apply.
Sunset 6:31 PMDark by 6:57 PMWaxing crescent, about 24% lit
Fri, Oct 16 · Select a time
Day GoodAfter dark GoodWhy Good?
A modest northwest swell is mostly blocked by Point Pinos, so expect some surge near the wall.
Swells: 2 ft, 12 s WNW · 2 ft, 14 s SSW · Wind 6 kt light
Rated by the most challenging conditions from 7 AM to 8 PM. After dark (8 PM to midnight) is shown as conditions, not as a dive window.
Low confidence because the wave model is in its first week of calibration here; this forecast is about 45 hours ahead, though recent forecasts have matched the buoy well. Capped at Good because confidence is Low.
Sheltered from most northwest swell. Local wind chop on the surface.
- Waves
- 0.4ft Estimate
- Swell
- 2.6ft WNW · 12 sec
- Wind
- 9kt Cross-shore
- Tide
- 3.5ft
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
Low tide 7:37 AM (3.5 ft) · Roughest around 7 AM
Low confidence
Low confidence because the wave model is in its first week of calibration here; this forecast is about 39 hours ahead, though recent forecasts have matched the buoy well.
Sheltered from most northwest swell. Some surge possible near the wall.
- Waves
- 0.4ft Estimate
- Swell
- 2.4ft WNW · 12 sec
- Wind
- 6kt Light
- Tide
- 4.7ft
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
High tide 1:58 PM (4.8 ft) · Roughest around 1 PM
Low confidence
Low confidence because the wave model is in its first week of calibration here; this forecast is about 45 hours ahead, though recent forecasts have matched the buoy well. Capped at Good because confidence is Low.
Sheltered from most northwest swell. Some surge possible near the wall.
- Waves
- 0.4ft Estimate
- Swell
- 2.4ft WNW · 12 sec
- Wind
- 8kt Cross-shore
- Tide
- 4.2ft
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
Roughest around 4 PM
Low confidence
Low confidence because the wave model is in its first week of calibration here; this forecast is about 48 hours ahead, though recent forecasts have matched the buoy well. Capped at Good because confidence is Low.
Sunset 6:30 PMDark by 6:56 PMFirst quarter, about 34% lit
Sheltered from most south swell. Some surge possible near the wall.
- Waves
- 0.4ft Estimate
- Swell
- 1.9ft SSW · 14 sec
- Wind
- 5kt Light
- Tide
- 1.3ft
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
Low tide 10:14 PM (0.6 ft) · Roughest around 8 PM
Low confidence
Low confidence because it is about 52 hours out, though recent forecasts have matched the buoy well. Capped at Good because confidence is Low.
Reduced visibility after dark; access rules still apply.
Sunset 6:30 PMDark by 6:56 PMFirst quarter, about 34% lit
Sat, Oct 17 · Select a time
Day GoodAfter dark GoodWhy Good?
A modest short-period northwest swell is mostly blocked by the Monterey Peninsula, so expect some surge near the wall.
Swells: 3 ft, 7 s WNW · 2 ft, 12 s WNW · 2 ft, 17 s SSW · Wind 10 kt cross-shore
Rated by the most challenging conditions from 7 AM to 8 PM. After dark (8 PM to midnight) is shown as conditions, not as a dive window.
Low confidence because it is about 75 hours out, though recent forecasts have matched the buoy well.
Sheltered from most northwest swell. Some surge possible near the wall.
- Waves
- 0.5ft Estimate
- Swell
- 1.9ft WNW · 6 sec
- Wind
- 7kt Cross-onshore
- Tide
- 3.7ft
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
Low tide 9:03 AM (3.6 ft) · Roughest around 7 AM
Low confidence
Low confidence because it is about 63 hours out, though recent forecasts have matched the buoy well. Capped at Good because confidence is Low.
Sheltered from most northwest swell. Several factors near their limits at once.
- Waves
- 0.6ft Estimate
- Swell
- 2ft WNW · 12 sec
- Wind
- 5kt Light
- Tide
- 4ft
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
High tide 3:04 PM (4.5 ft) · Roughest around 12 PM
Low confidence
Low confidence because it is about 68 hours out, though recent forecasts have matched the buoy well.
Sheltered from most northwest swell. Some surge possible near the wall.
- Waves
- 0.8ft Estimate
- Swell
- 3.2ft WNW · 7 sec
- Wind
- 10kt Cross-shore
- Tide
- 2.7ft
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
Roughest around 7 PM
Low confidence
Low confidence because it is about 75 hours out, though recent forecasts have matched the buoy well.
Sunset 6:29 PMDark by 6:55 PMFirst quarter, about 44% lit
Sheltered from most northwest swell. Some surge possible near the wall.
- Waves
- 0.9ft Estimate
- Swell
- 3.3ft WNW · 7 sec
- Wind
- 8kt Cross-shore
- Tide
- 2ft
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
Low tide 11:18 PM (0.6 ft) · Roughest around 8 PM
Low confidence
Low confidence because it is about 76 hours out, though recent forecasts have matched the buoy well.
Reduced visibility after dark; access rules still apply.
Sunset 6:29 PMDark by 6:55 PMFirst quarter, about 44% lit
Sun, Oct 18 · Select a time
Day FairAfter dark FairWhy Fair?
A moderate northwest swell is mostly blocked by the Monterey Peninsula, so expect noticeable surge near the wall.
Swells: 6 ft, 12 s WNW · 2 ft, 16 s SSW · 1 ft, 12 s SSW · Wind 9 kt cross-shore
Rated by the most challenging conditions from 7 AM to 8 PM. After dark (8 PM to midnight) is shown as conditions, not as a dive window.
Low confidence because it is about 92 hours out, though recent forecasts have matched the buoy well.
Sheltered from most west swell. Some surge possible near the wall.
- Waves
- 1.1ft Estimate
- Swell
- 3.8ft WNW · 12 sec
- Wind
- 7kt Cross-onshore
- Tide
- 3.6ft
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
High tide 7:17 AM (3.8 ft) · Low tide 11:05 AM (3.5 ft) · Roughest around 10 AM
Low confidence
Low confidence because it is about 90 hours out, though recent forecasts have matched the buoy well.
Sheltered from most northwest swell. Noticeable surge near the wall.
- Waves
- 1.1ft Estimate
- Swell
- 5.6ft WNW · 12 sec
- Wind
- 9kt Cross-shore
- Tide
- 3.6ft
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
Roughest around 12 PM
Low confidence
Low confidence because it is about 92 hours out, though recent forecasts have matched the buoy well.
Sheltered from most northwest swell. Noticeable surge near the wall.
- Waves
- 1.2ft Estimate
- Swell
- 5ft WNW · 8 sec
- Wind
- 16kt Cross-shore
- Tide
- 4.3ft
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
High tide 4:24 PM (4.4 ft) · Roughest around 5 PM
Low confidence
Low confidence because it is about 97 hours out, though recent forecasts have matched the buoy well.
Sunset 6:27 PMDark by 6:53 PMFirst quarter, about 55% lit
Sheltered from most northwest swell. Noticeable surge near the wall.
- Waves
- 1.1ft Estimate
- Swell
- 6ft WNW · 12 sec
- Wind
- 16kt Cross-shore
- Tide
- 2ft
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
Roughest around 9 PM
Low confidence
Low confidence because it is about 101 hours out, though recent forecasts have matched the buoy well.
Reduced visibility after dark; access rules still apply.
Sunset 6:27 PMDark by 6:53 PMFirst quarter, about 55% lit
Mon, Oct 19 · Select a time
Day FairAfter dark FairWhy Fair?
Wind and chop are both near their limits at once.
Swells: 5 ft, 12 s WNW · 2 ft, 15 s SSW · 0.9 ft, 18 s S · Wind 14 kt cross-onshore
Rated by the most challenging conditions from 7 AM to 8 PM. After dark (8 PM to midnight) is shown as conditions, not as a dive window.
Low confidence because it is about 111 hours out, though recent forecasts have matched the buoy well.
Sheltered from most northwest swell. Several factors near their limits at once.
- Waves
- 0.9ft Estimate
- Swell
- 5.2ft WNW · 12 sec
- Wind
- 14kt Cross-onshore
- Tide
- 3.9ft
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
High tide 7:44 AM (4 ft) · Roughest around 7 AM
Low confidence
Low confidence because it is about 111 hours out, though recent forecasts have matched the buoy well.
Sheltered from most northwest swell. Several factors near their limits at once.
- Waves
- 0.8ft Estimate
- Swell
- 4.9ft WNW · 12 sec
- Wind
- 17kt Cross-onshore
- Tide
- 3.2ft
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
Low tide 12:28 PM (3.2 ft) · Roughest around 12 PM
Low confidence
Low confidence because it is about 116 hours out, though recent forecasts have matched the buoy well.
21 kt cross-shore wind roughs up the surface. Sheltered from most northwest swell.
- Waves
- 0.9ft Estimate
- Swell
- 5.9ft WNW · 12 sec
- Wind
- 21kt Cross-shore
- Tide
- 4ft
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
High tide 5:41 PM (4.3 ft) · Roughest around 4 PM
Low confidence
Low confidence because it is about 120 hours out, though recent forecasts have matched the buoy well.
Sunset 6:26 PMDark by 6:52 PMFirst quarter, about 65% lit
24 kt cross-shore wind roughs up the surface. Sheltered from most northwest swell.
- Waves
- 1ft Estimate
- Swell
- 4.9ft WNW · 12 sec
- Wind
- 24kt Cross-shore
- Tide
- 2.7ft
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
Roughest around 9 PM
Low confidence
Low confidence because it is about 125 hours out, though recent forecasts have matched the buoy well.
Reduced visibility after dark; access rules still apply.
Sunset 6:26 PMDark by 6:52 PMFirst quarter, about 65% lit
Tue, Oct 20 · Select a time
Day FairAfter dark FairNo wind forecast yet for part of this day; those hours cover swell and tide only.
Why Fair?
16 kt onshore wind chops up the entry and the surface swim.
Swells: 3 ft, 6 s WNW · 3 ft, 11 s WNW · 2 ft, 15 s SSW · Wind 16 kt onshore
Rated by the most challenging conditions from 7 AM to 8 PM. After dark (8 PM to midnight) is shown as conditions, not as a dive window.
Low confidence because it is about 136 hours out, though recent forecasts have matched the buoy well.
16 kt onshore wind chops up the entry. Sheltered from most west swell.
- Waves
- 0.6ft Estimate
- Swell
- 2.9ft WNW · 6 sec
- Wind
- 16kt Onshore
- Tide
- 4.2ft
From the CDIP MOP nearshore wave model (Scripps Institution of Oceanography) at about 15 m depth off this site. An estimate, not a measurement at the beach.
High tide 8:05 AM (4.2 ft) · Roughest around 8 AM
Low confidence
Low confidence because it is about 136 hours out, though recent forecasts have matched the buoy well.
Sheltered from most northwest swell. Some surge possible near the wall.
- Waves
- 0.8ft Estimate
- Swell
- 5.8ft WNW · 13 sec
- Wind
- –
- Tide
- 3ft
Beyond the CDIP MOP forecast: the offshore wave forecast scaled the way MOP scales it at this site. An estimate, not a measurement at the beach.
Low tide 1:23 PM (2.7 ft) · Roughest around 3 PM
Low confidence
Low confidence because it is about 143 hours out, though recent forecasts have matched the buoy well.
Sheltered from most northwest swell. Some surge possible near the wall.
- Waves
- 1ft Estimate
- Swell
- 6.4ft WNW · 13 sec
- Wind
- –
- Tide
- 4.2ft
Beyond the CDIP MOP forecast: the offshore wave forecast scaled the way MOP scales it at this site. An estimate, not a measurement at the beach.
High tide 6:47 PM (4.3 ft) · Roughest around 6 PM
Low confidence
Low confidence because it is about 146 hours out, though recent forecasts have matched the buoy well.
Sunset 6:25 PMDark by 6:51 PMWaxing gibbous, about 75% lit
Sheltered from most northwest swell. Noticeable surge near the wall.
- Waves
- 1.1ft Estimate
- Swell
- 6.6ft WNW · 13 sec
- Wind
- –
- Tide
- 4ft
Beyond the CDIP MOP forecast: the offshore wave forecast scaled the way MOP scales it at this site. An estimate, not a measurement at the beach.
Roughest around 8 PM
Low confidence
Low confidence because it is about 148 hours out, though recent forecasts have matched the buoy well.
Reduced visibility after dark; access rules still apply.
Sunset 6:25 PMDark by 6:51 PMWaxing gibbous, about 75% lit
Hourly outlook 7 days · tap any hourhold and drag the chart
After darkOvernight
Tap any hour for details.
Entry & parking
Shore entry
Entry: Easy sandy beach entry at San Carlos Beach Park. Most dives follow the breakwater wall or head out over the sand toward the kelp.
Parking: Paid street parking and lots along Cannery Row and Foam Street. A dive shop, showers and food are right at the site.
Access: No permit needed.
Directions to the entryDirections to parking
Entry hazards
Boat traffic near the harbor mouth, so stay along the wall. Big swells still push surge into the shallows by the wall.
Route: Metridium Fields
From the pump house on the west side of San Carlos Beach, follow the big pipe out to its end (about 40 ft), then swim north about 10 yards to a field of white Metridium anemones on rocky outcrops (45 to 60 ft). It is a long swim, so watch your air and surface on the pipe or near shore, not out in the boat lane. Good buoyancy matters: don't land on the anemones.
Live cams & observations
Recent offshore observations · Buoy 46236
- Wave height
- 4.3ft
- Period
- 13s
- Water
- 64°F
Live cams
Randall Spangler's conditions guide · Monterey County Dive Reports
About this dive site

The diving
About 10 to 50 ft along the breakwater wall and out over sand and kelp.
Conditions & exposure
Only a narrow slice of northwest swell (about 311 to 325 degrees, between Point Pinos and Año Nuevo) reaches the Breakwater directly. The Monterey Peninsula blocks everything from the west and south; what gets in wraps around, and long-period swell wraps best.
Hazards & considerations
Good for new divers on calm days; the most forgiving entry in the area.
Advanced forecast & data
This site's forecast combines offshore wave data, predicted ocean conditions, and Breakwater's exposure to incoming swell.
Show the data and method
Buoy 46236, Monterey Canyon Outer: last 48 hours
Swell trains now (buoy 46236 spectrum, 3:00 PM): 3 ft at 14 s from 284° (WNW) · wind waves 3 ft at 7 s. The rating still uses the buoy's single swell and wind-wave split; the full spectrum is being compared against it.
Forecast vs. buoy 46236
The raw GFS-Wave forecast is running about 0.7 ft low at buoy 46236 today (last 24 hours). The SurgeCast forecast corrects for it.
Wave height
Peak period
Buoy (measured)SurgeCast forecast (corrected)GFS-Wave (raw)Last 3 days and next 2
For comparison, the NWS marine grid ran 0.1 ft low over the same 24 hours. Low means the forecast was smaller than what the buoy measured; high means bigger.
Download the forecast-vs-buoy data (CSV) · NOAA's own spot-check (a handful of NOAA forecasts against this buoy; heights in meters; posted Tue, Oct 13)
Forecast check: The wave model is scaled by 1.12 at the Monterey Canyon Outer buoy (a starting estimate until 7 days of readings are logged). After that, over the last 36 hours the forecast has matched the Monterey Canyon Outer buoy well (69 readings compared).
Validation: Validation in progress: 69 forecast-and-buoy pairs so far since Tue, Oct 13. Accuracy numbers appear here once there are 100 pairs over at least 3 days.
Buoy split now: swell 3 ft at 13.3 s from the WNW, 12% reaches this site; wind waves 3 ft at 6.7 s from the WNW, 12% reaches this site.
View official NOAA forecast chart
The chart did not load.
Red dots: the buoy. Blue: the latest NWPS forecast; black and light blue: earlier runs. Green: the global GFS-Wave model. Times are UTC (subtract 7 hours for Pacific daylight time). View the full forecast at NOAA
Forecast models
Waves from the NOAA GFS-Wave (WAVEWATCH III) model, run 18Z Wed, Oct 14 at buoy 46236, corrected against what that buoy has measured (systematic factor 1.12, seeded until 7 days of data are logged). The rating uses each hour's waves, wind and tide. Wind and air temperature come from the NWS forecast for the water off Breakwater, issued Wed, Oct 14, 1:26 PM PDT.
NWS marine forecast: Monterey Bay
Tonight: W wind around 5 kt, veering to NE late this evening and early morning, then becoming NE 5 to 10 kt late. Seas 3 to 4 ft. Wave Detail: NW 3 ft at 8 seconds and SW 2 ft at 15 seconds.
Thu: NE wind 5 to 10 kt, backing to NW in the afternoon. Seas around 3 ft. Wave Detail: W 3 ft at 7 seconds and SW 2 ft at 15 seconds.
Thu Night: NE wind 5 to 10 kt. Seas around 3 ft. Wave Detail: NW 2 ft at 7 seconds and SW 2 ft at 15 seconds.
Fri: NE wind 5 to 10 kt, becoming NW in the afternoon. Seas around 3 ft. Wave Detail: W 2 ft at 11 seconds.
Issued Wed, Oct 14, 2:38 PM PDT
View official NOAA swell-systems chart
The chart did not load.
Each color is one swell system; arrow length shows its size. A band at 15 s and up means long-period swell and surge. Times are UTC. View the full forecast at NOAA
Rating logic
- Surge
- The rating turns each swell into a "surge index" in feet: the height that reaches this site, weighted up for longer periods because long swell moves the water harder near the bottom. Here the index moves from Great to Good at 0.8, Fair at 1.2, Rough at 1.6 and Severe at 2.2 ft. Right now it is 0.5 ft.
- Direction
- Only a narrow slice of northwest swell (about 311 to 325 degrees, between Point Pinos and Año Nuevo) reaches the Breakwater directly. The Monterey Peninsula blocks everything from the west and south; what gets in wraps around, and long-period swell wraps best.
- Wind
- Onshore wind here blows from the NNE. Onshore wind over about 10 kt chops up entries and surface swims; a strong offshore wind (over 15 kt) pushes surface swimmers out. Gusts count for half.
- Tide
- Heights at the Monterey tide station, in feet above mean lower low water. The entry is easiest between -0.5 and 6 ft; tide only nudges the rating, except that a high tide of 5 ft or more with swell rates one level rougher here.
- Trend and confidence
- The trend compares the last 9 hours at the buoy with the next 12 hours of forecast; a building long-period swell can push a borderline day one step worse. Confidence is High for a fresh buoy reading or a forecast for the next 12 hours, and drops with lead time, a backup buoy, or a forecast that has been missing the buoy.
- Limits
- A model, not a guarantee. Back-tested on 137 dated diver reports, it matched the reported level 72% of the time and was within one level 96% of the time (tuned on those same reports, so expect a little less). Always look before you go in.
Sources
- NDBC buoy 46240 (Cabrillo Point) Off Lovers Point. Silent since 2026-04-30; it is used again automatically if it returns.
- NDBC buoy 46236 (Monterey Canyon Outer) At the mouth of the bay; it usually reads 2 to 3 ft higher than the beaches, which the rating accounts for.
- NDBC buoy 46239 (Point Sur)
- CDIP station 158 (buoy 46240)
- CDIP station 156 (buoy 46236)
- NWPS viewer, Monterey office
- NWS point forecast
- NOAA tide predictions, Monterey
- Photo and font credits
