San Francisco Bay South of the Bay Bridge Marine Forecast
| Today...S Wind Around 5 Kt, Veering To Nw Early This Afternoon, Then Becoming W 10 To 15 Kt Late. Patchy Fog This Morning. |
| Tonight...W Wind 5 To 10 Kt, Easing To Around 5 Kt After Midnight. |
| Thu...W Wind Around 5 Kt, Rising To 10 To 15 Kt In The Afternoon. |
| Thu Night...W Wind 10 To 15 Kt, Easing To 5 To 10 Kt After Midnight. |
| Fri...W Wind 5 To 10 Kt, Rising To 10 To 15 Kt In The Afternoon. |
| Fri Night...W Wind 10 To 15 Kt, Becoming Sw 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 5 To 10 Kt After Midnight. |
| Sun...Sw Wind 5 To 10 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. |
| Area Forecast Discussion National Weather Service San Francisco CA 511am PDT Wednesday September 23 2026 .SHORT TERM... Issued at 1103pm PDT Tuesday September 22 2026 (Tonight through Thursday) Marine layer between 1500-2000 feet deep as of Tuesday evening. Low clouds cover areas from Point Reyes southward to Big Sur with a decent push of stratus in SF Bay and the Monterey Bay region including Salinas valley. There is an increasing northerly gradient now to about 5 mb from ACV-SFO that is eroding the stratus from north to south for the North Bay. This is occurring as high pressure is trying to nose into the region from the southwest. 850 mb temps warming to around 20-21 celsius with hot inland temps for the interior Central Coast (90s) with mainly upper 80s to around 90 for the interior North/South/East Bays on Weds afternoon. With persistent onshore winds not really a late September setup where we would expect warm/hot temps at the coast. Looking at the European extreme forecast index we see no areas of interest suggesting this is just a typical warm late Sept day on tap. Models hold onto the warm inland temps for one more day through Thursday. However by Thursday afternoon a storm well to our north will induce a strong onshore/westerly push, ushering in a moderate to strong afternoon/evening seabreeze on Thursday that will signal relief for the Bay Area while the interior Central Coast remains warm/hot through Thursday evening. Long Term Issued at 1103pm PDT Tuesday September 22 2026 (Thursday night through next Tuesday) A fairly well defined early autumn dry cold front passage will push through the region Thursday night into Friday morning. No precipitation is forecast for the Bay Area as it remains confined to areas north of Cape Mendocino. However, enough cooling and mixing aloft to essentially erode or mix out the marine layer quickly by early Friday morning. Temps still remain seasonably warm/mild Friday but the cooling trend will have begun. Weather this weekend looks nice for the last weekend of September. Certainly no hot weather with inland temps mainly 70s to lower 80s Saturday/Sunday with enough cold air aloft and mixing to keep skies sunny with perhaps only some patchy morning low clouds near the coast and bays. Early look at next week shows no signal for precipitation or abnormally hot weather and no fall offshore wind events. Pattern looks pretty zonal suggesting temps running near seasonal norms. Marine (Today through Monday) Issued at 445am PDT Wednesday September 23 2026 Northerly breezes will ease early Wednesday near shore, but remain moderate to fresh over the outer waters. Locally hazardous conditions will persist for small craft over the outer waters through Wednesday night. Winds will weaken further across all waters on Thursday. Friday will see an increase in northwest winds accompanied by seas building back up to rough, and continuing into the weekend. Fire Weather Issued at 440am PDT Wednesday September 23 2026 Marine layer returned again impacting lower portions of the district this morning with excellent RH recovery. Similar to yesterday morning patchy fog will impact the N Bay Valleys, Monterey Peninsula and the Salinas Valley. Unlike yesterday two other notable differences: the exact footprint of the marine layer is slightly different with less coverage over the E Bay Valleys and along the Big Sur coastline and moderate to poor recoveries above the marine layer. Speaking of the drier conditions aloft, RH recoveries are 15 to 50 pct drier depending on locations. In other words, nocturnal drying returned. Otherwise, warmer and drier across the board, especially interior locations. MM NOAA San Francisco Bay Area Office: Watches - Warnings - Advisories CA...None. PZ...Small Craft Advisory until 5am PDT early this morning for Pigeon Pt to Pt Pinos 10-60 NM-Pt Arena to Pt Reyes 0-10 nm. Small Craft Advisory until 3am PDT Thursday for Pt Arena to Pt Reyes 10-60 NM. x.com/nwsbayarea |
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