Point Forecast: 20NM W San Francisco CA
 37.75N 122.83W (Elev. 0 ft)
Last Update: 8:28 pm PDT Sep 19, 2025
Tabular Forecast
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Weather ElementsWeather/PrecipitationMarine Weather
Temperature (°F)
Dewpoint (°F)
Heat Index (°F)

Surface Wind  
Sky Cover (%)
Precipitation Potential (%)
Relative Humidity (%)
Rain
Thunder
Fog
Swell Period
Swell Hgt/Dir
Swell 2 Period
Swell 2 Hgt/Dir
Wind Wave Height
Significant Wave Height
Freezing Spray

48-Hour Period Starting:       Back 2 Days  

Date09/1909/20
Hour (PDT)222300010203040506070809101112131415161718192021
Surface Wind (kt)54433333333334457891010111111
Wind DirWWWWWWWWWWWWWWWNWWWWNWWNWWNWWNWWNWNWNW
Gust
Significant Wave Height (ft) 444444433333333333333333
Swell Height (ft) 433333333333322222222222
Swell Dir310310310310310310310310310310310310310310310310310310310300300300300300
Swell Period (sec) 1010101010101099999999999999999
Swell 2 Height (ft) 222222222222222222222222
Swell 2 Dir200200200200200200200200200200200200200210210210210210210210210210210210
Swell 2 Period (sec) 141414141414141313131313131313131313131313131313
Wind Wave Height (ft) 100000000000011111122222

Date09/21
Hour (PDT)222300010203040506070809101112131415161718192021
Surface Wind (kt)111010101010109999991010101111111414141818
Wind DirNWNWNWNWWNWWNWWNWWNWWNWWNWWNWWNWWNWWNWWNWWNWWNWWNWWNWNWNWNWNWNW
Gust2323
Significant Wave Height (ft) 333333333333344444455555
Swell Height (ft) 222222233333322222222222
Swell Dir300300300300300300300300300300300300300300300300300300300300300300300300
Swell Period (sec) 911111111111112121212121211111111111199999
Swell 2 Height (ft) 222222222222222222222222
Swell 2 Dir210200200200200200200210210210210210210210210210210210210210210210210210
Swell 2 Period (sec) 131313131313131313131313131313131313131313131313
Wind Wave Height (ft) 222222211111122222244444

Additional Forecasts and Information
International System of UnitsForecast Discussion
Marine Point ForecastHourly Weather Graph
National Marine ForecastsTide Information
River Stage Summary24 Hour Precipitation Summary
NWS Office Map