Surf Forecasts:
How big are the waves at Half Moon Bay today (12 Sep):
- Morning surf: Morning surf (12 Sep, local time) - 3ft (0.9m), 15s period with SW swell.
- Afternoon surf: Afternoon surf (12 Sep, local time) - 2.5ft (0.8m), 15s period with SW swell.
- Evening surf: Evening surf (12 Sep, local time) - 2.5ft (0.8m), 14s period with SW swell.
The current surf forecast for Half Moon Bay at 5AM is: 0.9m 15s primary swell from a Southwest direction and 0.9m 10s secondary swell from a West-northwest direction (forecast issued at 10:00pm September 11). The wind direction is predicted to be glassy and the swell rating is 2.
| Time (PDT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (12 Sep) | 3ft (0.9m) | 15s |
| Afternoon (12 Sep) | 2.5ft (0.8m) | 15s |
| Evening (12 Sep) | 2.5ft (0.8m) | 14s |
Table - waves today at Half Moon Bay. (Swell directed towards the surf break)
Short Range ForecastLight rain (total 5mm), mostly falling on Sat night. Very mild (max 15°C on Fri night, min 13°C on Fri night). Wind will be generally light. | ||||||||||||||||||
Fri 11 | Saturday 12 | Sunday 13 | ||||||||||||||||
8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | |
Swell Height Map |  |  |  |  |  |  |  | |||||||||||
Wave Height (m) Direction Period (s) | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | WNW 8 | WNW 8 | WNW 8 | WNW 8 |
Wave Graph  | ||||||||||||||||||
 kJ | 367 | 367 | 358 | 344 | 322 | 318 | 258 | 251 | 245 | 241 | 245 | 248 | 167 | 167 | 164 | 176 | 183 | 151 |
Wind (km/h) | ||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | cross-off | glassy | cross-off | glassy | cross-off | cross | cross-on | glassy | cross | cross | cross-off | cross | cross-on | cross-on | cross-on | cross-on |
High Tide | 1:57AM2.76m | 2:22PM2.86m | 2:43AM2.64m | 2:54PM2.85m | ||||||||||||||
Low Tide | 7:39PM0.07m | 7:54AM-0.02m | 8:21PM-0.03m | 8:30AM0.20m | 9:03PM-0.05m | |||||||||||||
 | | | |  | | | | |  | | |  | |  | |  | | |
 | — | — | — | 6:48 | — | — | — | — | — | — | — | 6:50 | — | — | — | — | — | — |
 | — | — | — | — | — | — | — | 7:34 | — | — | — | — | — | — | — | 7:31 | — | — |
mm | — | — | — | — | — | — | — | — | — | 1 | 2 | 1 | 1 | — | — | — | — | — |
Temp °C | 15 | 14 | 14 | 13 | 13 | 15 | 15 | 15 | 14 | 13 | 13 | 13 | 14 | 15 | 15 | 15 | 15 | 15 |
Feels °C | 14 | 13 | 12 | 12 | 12 | 14 | 13 | 12 | 13 | 13 | 12 | 11 | 11 | 12 | 12 | 13 | 14 | 13 |
Swell 1 Height (m) Direction Period (s) | WNW 9 | WNW 9 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 9 | WNW 9 | WNW 9 | WNW 9 | WNW 9 | WNW 8 | WNW 8 | WNW 8 | WNW 8 |
| kJ | 193 | 197 | 218 | 169 | 169 | 166 | 132 | 132 | 132 | 126 | 119 | 92 | 90 | 88 | 160 | 176 | 183 | 151 |
Swell 2 Height (m) Direction Period (s) | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 |
| kJ | 367 | 367 | 358 | 344 | 322 | 318 | 258 | 251 | 245 | 241 | 245 | 248 | 167 | 167 | 164 | 162 | 153 | 147 |
Swell 3 Height (m) Direction Period (s) | WNW 11 | WNW 11 | SSW 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 4 | S 8 | WSW 21 | WSW 20 | SSW 5 | SSW 5 | SSW 5 |
| kJ | 24 | 24 | 10 | 10 | 8 | 8 | 8 | 7 | 7 | 6 | 6 | 6 | 4 | 43 | 40 | 7 | 7 | 5 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | SW 2 | SSW 3 | — | SSW 3 | SSW 4 | SSW 5 | SSW 5 | SSW 5 | — | — | — |
| kJ | — | — | — | — | — | — | — | 1 | 2 | — | 2 | 17 | 14 | 14 | 12 | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 38 | 0 | 0 | 0 | 160 | 160 | 160 | 160 | 0 | 0 |
Best forecast wave conditions in Washington State | ||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||
Header Global | ||||||||||||||||||
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Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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