San Francisco Bay north of the Bay Bridge, including San Pablo Bay, Suisun Bay, and West Delta, CA Marine Forecast
| Tonight...Sw Wind 5 To 10 Kt, Easing To Around 5 Kt Late. |
| Wed...Sw Wind Around 5 Kt, Rising To 5 To 10 Kt In The Afternoon. Patchy Fog In The Morning. |
| Wed Night...Sw Wind Around 5 Kt. |
| Thu...Sw Wind Around 5 Kt, Rising To 5 To 10 Kt In The Afternoon. |
| Thu Night...Sw Wind 5 To 10 Kt, Rising To 10 To 15 Kt After Midnight. |
| Fri...Sw Wind 10 To 15 Kt. |
| Fri Night...W Wind 10 To 15 Kt, Becoming Sw 5 To 10 Kt After Midnight. |
| Sat...Sw Wind Around 5 Kt, Rising To 5 To 10 Kt In The Afternoon. |
| Sat Night...Sw Wind 5 To 10 Kt. |
| Sun...Sw Wind 5 To 10 Kt. |
| Sun Night...W Wind 10 To 15 Kt, Becoming Sw 5 To 10 Kt After Midnight. |
| Area Forecast Discussion National Weather Service San Francisco CA 834pm PDT Tuesday September 22 2026 ...New .KEY MESSAGES... Updated at 1232pm PDT Tuesday September 22 2026 - Warming trend continues through Thursday - Cooler conditions Friday into the weekend Issued at 834pm PDT Tuesday September 22 2026 Marine layer around 1500-2000 feet based on 00z sounding and local observations. SFO to Sac gradient is 2.6 mb and stratus covering West Marin, all of the City and up into the Berkeley hills early this evening. Ridging to our southwest is trying to nose in and compress the marine layer overnight into Weds but seems to be having trouble with active PacNW trough and incoming surface low that will take aim on the Oregon coast by Thursday with some rain up there. Meanwhile well to our south Hurricane Polo is now a dangerous category 5 with Tropical Storm Odalys well to its west...after a brief lull the East Pac is active again. It would seem we are fortunate the PacNW trough remains fairly strong for so early in the autumn and seemingly keeping any of the remnant tropical activity well to our south. Latest cluster analysis shows fairly strong trough over the West Coast this weekend that will keep Bay Area temps below normal this weekend behind a dry cold frontal passage on Friday that will keep fall like temps in the 60s and 70s this weekend. Long range cluster trends for next week show more troughing than ridging with no real hint of hot Sept weather. This long wave pattern would continue to shunt any East Pac moisture well to our south and east. .SHORT TERM... Issued at 1232pm PDT Tuesday September 22 2026 (This evening through Wednesday night) An upper level trough is moving across Nevada this afternoon and will continue to shift into the Great Basin on Wednesday. As such, temperatures this afternoon are forecast to warm into the 60s near the coast, upper 60s to low 70s around the bayshore, and mid 70s to mid 80s across the interior with mostly sunny sky conditions across the interior. Breezy onshore flow will develop in the afternoon and evening hours with gusts of 20 to 30 mph near the coast, in the favored gaps and passes, and down the Salinas Valley. As the marine layer gradually compresses to around 1,500 feet tonight, we are expecting less of an inland intrusion of stratus. As such, temperatures are expected to cool into the 50s for much of the region overnight. More of a zonal flow is forecast on Wednesday which will lead to a warming trend. Temperatures Wednesday afternoon are forecast to reach into the upper 60s to mid 70s near the coast, upper 70s to mid 80s around the bayshore, and mid 80s to low 90s across the interior. The warmest interior portions of the Central Coast look to warm into low-to-upper 90s. This will result in pockets of moderate HeatRisk across the interior. As a result, drier conditions are forecast in elevations above the marine influences. Tomorrow night, look for again less inland extent of stratus and the warming trend to continue. Overnight temperatures are forecast to be in the mid 50s near the coast to lower 60s across the interior. However, the warming air mass aloft will result in the higher terrain only cooling into the 70s. Long Term Issued at 1232pm PDT Tuesday September 22 2026 (Thursday through next Monday) Thursday looks to be the warmest across the interior with similar temperatures to Wednesday elsewhere. On Friday, a developing trough off of the West Coast will return resulting in a cooling trend and deepening of the marine layer. The coolest conditions are expected Saturday and Sunday as a reinforcing trough deepens off of the California coast with temperatures up to 10-15 deg F below seasonal averages. Temperatures appear to rebound closer to normal for this time of year early next week as the trough flattens and the 500 mb height clusters point to a building ridge over the western United States. Marine (Tonight through next Sunday) Issued at 412pm PDT Tuesday September 22 2026 Northwest moderate to fresh breezes with strong gusts steadily diminish across the southern coastal waters while remaining elevated to the north on Wednesday. Rough northwest seas continue into Wednesday before gradually subsiding to moderate for a brief period on Thursday. By Friday, northwest winds increase again with building rough seas. Fire Weather Issued at 434am PDT Tuesday September 22 2026 Solid marine layer coverage along the coast and Salinas Valley overnight. Sounding and profilers put the depth of the marine layer around the 2,000-2,500 foot range. Definitely some compression on the marine layer leading to drizzlefest around the area. Seeing some reduced vsby too, which may lead to patchy fog early this morning for crews departing ICP for Timber/Plaskett. Above the marine layer moderate to excellent humidity recovery for the most part with the driest conditions above 3,000 feet. Otherwise, still valid for a warming and drying trend kicking off Tuesday with temperatures up to 10 degrees above normal and areas of moderate HeatRisk Wednesday and Thursday. The marine layer will compress below 1,000 feet during this warm-up with nocturnal drying expected above it. MM NOAA San Francisco Bay Area Office: Watches - Warnings - Advisories CA...None. PZ...Small Craft Advisory until 5am PDT Wednesday for Pigeon Pt to Pt Pinos 10-60 NM-Pt Arena to Pt Reyes 0-10 nm. Small Craft Advisory until 9pm PDT this evening for Pigeon Pt to Pt Pinos 0-10 nm. Small Craft Advisory until 3am PDT Wednesday for Pt Pinos to Pt Piedras Blancas 0-10 nm. Small Craft Advisory until 3am PDT Thursday for Pt Arena to Pt Reyes 10-60 NM. www.facebook.com/nwsbayarea x.com/nwsbayarea |
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