Swell Matrix

Area Forecast Discussion

National Weather Service San Francisco CA

1057 am PDT Thu apr 2 2026

Short Term

, Issued at 1145 PM PDT Wed Apr 1 2026 (Tonight through Friday)

A cold front passes through the region tonight, which will spread showers across the region from north to south. Ahead of its arrival, breezy southeasterly winds are being observed with gusts up to 20-30 mph for much of the region, while higher points of terrain see gusts up to 45 mph. Winds eventually become northwesterly after the frontal passage and will remain breezy into Thursday morning. In terms of rain amounts for the very near term, now through Thursday morning, the mountains and hills of the Bay Area and Santa Cruz County will see up to 0.25" while valley locations are closer to 0.05-0.15". For the rest of the Central Coast amounts look to range from 0.0-0.15", perhaps up to 0.25" in the Santa Lucia Range. Drier weather works in behind the frontal passage, with high temperatures making it into the 60s for interior valley locations, and in generally in the 50s along the immediate coastline and in higher points of elevation.

Long Term

..issued at 1145 PM PDT Wed Apr 1 2026 (Friday night through next Wednesday)

High pressure builds into the region on Friday and holds through the weekend. This will lead to warm and dry conditions, accompanied with offshore winds through the weekend. On Friday, the winds will be the strongest, as the pressure gradients tighten over northern California. The strongest winds will be found over the mountains, with gusts of 40 to 50 mph in the North Bay Interior Mountains with gusts of 30 to 40 mph in the East Bay Hills, Eastern Santa Clara Hills, and Santa Cruz Mountains. These winds ease Friday evening, with lighter winds expected for the weekend.

A pattern change looks likely early next week. Cooler weather would return along with the 20-40% chance for rain, favoring the North Bay.

Aviation

(18z TAFS) Issued at 1057 AM PDT Thu Apr 2 2026

Dry conditions continue to move in across the forecast area. High pressure will steepen the ACV-SFO and WMC-SFO pressure gradients tonight and Friday. Areas of low level wind shear (llws) will develop over the Bay Area tonight and Friday morning, highest probability of llws will be over the North Bay. VFR in the 18z TAFs.

Vicinity of SFO, VFR. West wind 15 to 25 knots in the afternoon and early evening. West to northwest wind decreasing to 5 knots tonight and early Friday morning, shifting to northeasterly around 5 knots Friday morning.

SFO Bridge Approach, Similar to SFO.

Monterey Bay Terminals, VFR. West to northwest winds 10 to 20 knots decreasing and becoming light and variable tonight then southeasterly 5 to 10 knots beginning early Friday morning.

Marine

(today through Tuesday) Issued at 1044 AM PDT Thu Apr 2 2026

Fresh to strong breezes developing over the coastal waters today including across the bays later this morning and afternoon. The stronger winds will result in hazardous conditions. Northerly breezes diminish and seas abate by the weekend.

Watches, Warnings, Advisories

Ca, None. PZ, Small Craft Advisory from 3 PM this afternoon to 9 PM PDT this evening for SF Bay N of Bay Bridge.

Small Craft Advisory until 3 AM PDT Friday for Mry Bay.

Small Craft Advisory until 3 AM PDT Friday for Pigeon Pt to Pt Pinos 0-10 nm-Pt Arena to Pt Reyes 0-10 nm-Pt Pinos to Pt Piedras Blancas 0-10 nm-Pt Reyes to Pigeon Pt 0-10 nm.

Small Craft Advisory until 3 PM PDT Friday for Pt Arena to Pt Reyes 10-60 NM.

Small Craft Advisory until 9 AM PDT Friday for Pigeon Pt to Pt Pinos 10-60 NM.

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