Swell Matrix

Area Forecast Discussion

National Weather Service San Francisco CA

423 pm PDT Wed Mar 25 2026

Short Term

, Issued at 1140 AM PDT Wed Mar 25 2026 (This afternoon through Thursday)

Not much change in the forecast in the short term. Temperatures early this afternoon are running about 5-10 degrees cooler than at this time yesterday, even cooler in some coastal spots a sign of a slightly robust marine layer. However, away from the coast, we're still expecting to see highs 10-15 degrees above normal. The progressive upper trough moving inland to our north will moderate overnight lows behind a weak cold front slightly lower from what we woke up to this morning, generally still in the 40s to low 50s across our area. The northerly flow behind the cold front today advecting cooler temperatures will evolve into slightly warming compressional downsloping winds later Thursday into early Friday as an upper level disturbance tracks inland to our south. Both HREF and ECMWF ensemble data show less than a 20% chance for winds exceeding advisory level across portions of the Northbay, less than 10% everywhere else.

Long Term

..issued at 1140 AM PDT Wed Mar 25 2026 (Thursday night through next Tuesday)

Quiet weather returns for Friday into the weekend with a ridging pattern reemerging offshore leading to warmer than normal temperatures, sunny skies and light winds. The timing for a pattern change continues to trend closer to the middle of next week, however consensus is improving for the potential for more widespread wetting rainfall with the deepening trough moving onshore Tuesday and Wednesday. With increased clouds and rain temperatures would shift to slightly below normal by Tuesday.

Aviation

(00z TAFS) Issued at 423 PM PDT Wed Mar 25 2026

Some coastal stratus has moved into the immediate coast of the San Mateo Peninsula, which should dissipate through the next couple of hours. Otherwise, generally VFR conditions continue with a few high clouds and westerly onshore breezes across the region. Light winds will develop overnight, with some low confidence for stratus development at the immediate coast. Thursday morning, a pulse of gentle north to northwest winds moves through the inland terminals with the rest of the region seeing some onshore winds developing a little later onwards.

Vicinity of SFO, VFR with a few high clouds through the TAF period. Breezy west-northwest winds persist through the evening hours with gusts to 30-34 kt. Winds gradually diminish in the late evening with light winds Thursday morning, before the breezy west- northwest winds resume during the afternoon.

SFO Bridge Approach, Similar to SFO.

Monterey Bay Terminals, Low confidence for VFR conditions tonight at MRY, not high enough to place a ceiling in the TAF, otherwise VFR throughout the TAF period. Breezy and gusty northwest winds persist into the evening hours, with winds turning light overnight. Thursday morning, light northerly winds will back to a northwest flow at MRY, with gentle northwest winds through the afternoon at SNS.

Marine

(tonight through next Monday) Issued at 423 PM PDT Wed Mar 25 2026

Hazardous conditions across the outer and inner waters have developed with increasing north-northwest gales. These conditions will persist tonight into Thursday morning across all outer waters. Conditions begin to improve south to north by Thursday evening, persisting over the northern outer waters through Friday afternoon. Wind and seas ease for the weekend, then begin to increase once again by the middle of next week a developing system begins to move toward shore.

Watches, Warnings, Advisories

Ca, None. PZ, Small Craft Advisory until 9 PM PDT this evening for Mry Bay-SF Bay N of Bay Bridge.

Gale Warning until 3 AM PDT Thursday for Pt Arena to Pt Reyes 0- 10 nm-Pt Reyes to Pigeon Pt 0-10 nm.

Small Craft Advisory until 9 PM PDT Thursday for Pigeon Pt to Pt Pinos 0-10 nm-Pt Pinos to Pt Piedras Blancas 0-10 nm.

Gale Warning until 9 AM PDT Friday for Pt Arena to Pt Reyes 10- 60 NM.

Gale Warning until 9 AM PDT Thursday for Pigeon Pt to Pt Pinos 10-60 NM.

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