San Francisco Bay South of the Bay Bridge Marine Forecast
| Today...Light And Variable Winds, Becoming Nw 10 To 15 Kt. |
| Tonight...W Wind 5 To 10 Kt. |
| Wed...Sw Wind 5 To 10 Kt. A Slight Chance Of Tstms In The Morning, Then A Chance Of Tstms In The Afternoon. |
| Wed Night...W Wind 5 To 10 Kt, Becoming Sw After Midnight. A Slight Chance Of Tstms In The Evening. |
| Thu...W Wind 5 To 10 Kt. |
| Thu Night...W Wind 5 To 10 Kt. |
| Fri...Sw Wind Around 5 Kt, Veering To W In The Afternoon. |
| Fri Night...Sw Wind 5 To 10 Kt. |
| Sat...Sw Wind 5 To 10 Kt. |
| Sat Night...W Wind 10 To 15 Kt, Becoming Sw 5 To 10 Kt After Midnight. Winds And Waves Higher In And Near Tstms. |
| Area Forecast Discussion National Weather Service San Francisco CA 1040am PDT Tuesday September 23 2025 Issued at 932am PDT Tuesday September 23 2025 After a slight warm bias in our forecast early this morning, temperatures have quickly increased back where we expected them to be under clear skies. No changes are needed to the short term forecast. Most of our attention has shifted to the incoming showers and possible thunderstorms arriving to the Central Coast tonight, spreading north to include the Bay Area by Wednesday morning. The latest high resolution guidance is showing most activity through the morning hours. While a good amount of rain is expected across the Central Coast, much less rain is anticipated to reach the ground further north. As such there is a chance for dry lightning in the Central and North Bay. More details on this threat in the Fire Weather Section. Finally, the latest HRRR (High-Resolution Rapid Refresh) is showing convective activity may re-intensify Wednesday night. Our current forecast doesn't show this as a strong possibility, but that could change if more members of the NBM follow this trend. .SHORT TERM... Issued at 337am PDT Tuesday September 23 2025 (Today and tonight) For those looking for a taste of summer, today is your day as high temperatures will be about 5 to 15 degrees above normal. What does that mean in terms of the thermometer? Highs will be in the 90s for many interior locations, with some sites potentially cracking 100. For those closer to the coast, highs will range from the 70s to mid 80s. Skies will be mostly sunny throughout the day, but clouds will start to infiltrate later in the afternoon or evening as low pressure approaches the region. Unsettled weather should stay at bay until Wednesday. A few CAMs show showers trying to flirt with our southern waters or against southern Monterey County. Long Term Issued at 337am PDT Tuesday September 23 2025 (Wednesday through Monday) The forecast is on track with an upper level low pressure system slated to move into Central California. Showers are expected to spread up from the south and creep into the Bay Area. Convective parameters still look fairly decent across the region, favoring Monterey and San Benito counties and gradually expanding into the Bay Area. Thunder and precipitation chances have been reduced in the North Bay, but a few stray showers are possible up there. PWATs (Precipitable Waters) remain elevated around 1.0-1.4 meaning thunderstorms should be wet and dry lightning is a lower risk. Nonetheless, if you're going to be out and about tomorrow remember, when thunder roars, go in doors. See a flash, make a dash. And if you're driving and encounter a rain shower, remember roads might be a little slick given we haven't had much rain this season. After Wednesday, more seasonal weather is on tap. The upper low is expected to sink back into southern CA with a brief bout of upper level ridging nosing in Friday. This will bring a brief warm up with more seasonal temperatures on tap for the weekend and into early next week as the pattern becomes more neutral. Marine (Today through Sunday) Issued at 932am PDT Tuesday September 23 2025 Light winds continue through mid week. Isolated rain showers and thunderstorms arrive to the southern waters late Tuesday and linger through Wednesday. Thunderstorms will pose the risk of lightning, as well as locally heavy rainfall and gusty winds. Winds increase to a fresh breeze by the end of the week. Moderate seas will prevail through Wednesday, building to become rough in the outer waters Thursday into Friday. Fire Weather Issued at 932am PDT Tuesday September 23 2025 Warm and dry weather today will be followed by a chance for thunderstorms overnight and continuing through the day Wednesday. While the Central Coast is expecting a good amount of wetting rain showers to accompany any lightning, it looks much drier further north. There is still enough instability to trigger some thunderstorms across the central and North Bay Wednesday, bringing a slight chance for dry lightning to those areas on Wednesday. NOAA San Francisco Bay Area Office: Watches - Warnings - Advisories CA... Heat Advisory until 7pm PDT this evening for CAZ006-508-510-513- 515. PZ...None. x.com/nwsbayarea |
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