San Francisco Bay South of the Bay Bridge Marine Forecast
| Tonight...W Wind 10 To 15 Kt, Easing To 5 To 10 Kt Late This Evening, Then Becoming Sw After Midnight. |
| Thu...S Wind 5 To 10 Kt, Becoming Sw 10 To 15 Kt In The Afternoon. A Chance Of Rain. |
| Thu Night...W Wind 5 To 10 Kt. A Slight Chance Of Rain In The Evening. |
| Fri...W Wind Around 5 Kt, Rising To 10 To 15 Kt In The Afternoon. |
| Fri Night...W Wind 10 To 15 Kt, Easing To 5 To 10 Kt After Midnight. |
| Sat...Sw Wind Around 5 Kt, Veering To W In The Afternoon. |
| Sat Night...W Wind 10 To 15 Kt, Becoming Sw Around 5 Kt After Midnight. |
| Sun...Sw Wind Around 5 Kt, Becoming W 10 To 15 Kt In The Afternoon. |
| Sun Night...W Wind 10 To 15 Kt, Easing To 5 To 10 Kt After Midnight. |
| Labor Day...Sw Wind Around 5 Kt, Veering To W In The Afternoon. |
| Mon Night...W Wind 10 To 15 Kt, Becoming Sw Around 5 Kt After Midnight. |
| Area Forecast Discussion National Weather Service San Francisco CA 603pm PDT Wednesday September 2 2026 .SHORT TERM... Issued at 1159am PDT Wednesday September 2 2026 (This afternoon through Thursday) KMUX shows a band of light precipitation bisecting the Bay Area and moving east. Still waiting on a bucket tip south of the Golden Gate Bridge; nonetheless, it won't amount to much as the band continues to weaken. This pre-frontal rain has overperformed the official forecast with Mt. Tam measuring 0.57" in the last 24 hours. The overperformance is likely due to the struggles of guidance/models in the shoulder seasons. The cold frontal passage will occur tomorrow afternoon/evening from northwest to southeast, bringing renewed chances for rainfall alongside well below normal temperatures and cloudy conditions. This second round of rain also runs the risk of overperformance; however, the forecast has trended wetter. Totals of 0.10"-0.50" for most of the North Bay and 0-0.10" south of the Golden Gate Bridge are expected with accumulation south of the Golden Gate Bridge primarily favoring the San Francisco Peninsula Coast. Looking at the 90th percentile, totals get bumped up with up to 1.00" possible in the higher terrain of the North Bay and up to 0.50" along the San Francisco Peninsula Coast. While rainfall is expected to be beneficial, wet roadways will create slick driving conditions and increase stopping distance. Wind Advisory criteria is not expected to be met; however, gusts of 30-40 mph can be expected through gaps/passes and down the Salinas Valley. Long Term Issued at 1159am PDT Wednesday September 2 2026 (Friday through next Tuesday) A cutoff low will spawn in the Pacific Northwest from remnant upper- level troughing as ridging expands westward into the Desert Southwest. The low is expected to fill through the weekend, giving the ridge increasing influence over the forecast. As such, a gradual warming and drying trend and the reformation of the marine layer is expected over the weekend. These features will also be enough to shunt moisture from Tropical Storm Marie south of the California Bight, at least for now. Even with a cutoff low in play, there is relatively good agreement in the forecast through Monday. By Tuesday, the ECMWF (European Centre for Medium-Range Weather Forecasts) and GFS (Global Forecast System) begin to drastically diverge on their solutions with Marie. The one to watch will be the ECMWF as it has another cutoff low digging, absorbing, and bringing what was Marie into Central California, which would be a low probability outlier at the moment. It's imperative to note that if it reaches California: Marie will no longer be tropical and the primary impact will be rainfall. Marine (Tonight through next Tuesday) Issued at 603pm PDT Wednesday September 2 2026 Northwesterly breezes will be light to moderate through the remainder of the week and into the weekend with moderate wind driven seas. Diurnal winds will increase more Friday and Saturday afternoon, especially in vicinity of Monterey Bay. The tropical activity well to our south will produce long period southerly swell beginning Friday and continuing through the weekend into the beginning of next week. NOAA San Francisco Bay Area Office: Watches - Warnings - Advisories CA...None. PZ...None. x.com/nwsbayarea |
San Francisco Radar
Southwest Radar