textproduct: San Francisco Bay Area

KEY MESSAGES

Updated at 1145 PM PDT Tue Jun 2 2026

- Relatively weak cold front pushes south through our area today

- Breezy to gusty onshore winds this afternoon and tonight

- Notable cool down for the weekend into the beginning of next week remains on track

UPDATE

Issued at 920 AM PDT Wed Jun 3 2026

Much less stratus this morning than 24 hours ago thanks largely in part to an approaching cold front and an increasing N-S gradient. As noted below, made some further refinements on today's max temperatures away from the coast. Lowered max temps today for inland valleys 3 to 5 degrees.

Otherwise, the more noteworthy weather impact today will be the winds. The increasing N-S gradient with onshore flow will lead to gusty winds over the waters, along the immediate coast, and inland valleys/passes. Peak winds will be late this afternoon through early this evening with gusts 30 to 40 mph in the windiest locations.

MM

SHORT TERM

Issued at 1145 PM PDT Tue Jun 2 2026 (Today and tonight)

The effects of a progressive, short wave upper trough beginning to transect our area to the north overnight are already being felt over the North Bay with drier air mixing closer to the surface and likely to hold off a deeper marine layer push into some of the North Bay valleys for the remainder of the overnight into early Wednesday morning. Where the marine layer does make inroads tonight, we'll see clearing a little sooner than what we saw on Tuesday. While clearing is expected along the coast, the strengthening onshore flow will maintain influence across coastal areas, so dropped highs a few degrees from NBM for most of the immediate coast line, and may need to be lowered further based on trends later this morning. Otherwise temperatures today will be a few degrees warmer inland than Tuesday, except for the North Bay where the temps will jump into the 80s to low 90s.

As the upper trough shifts east later this afternoon, gradient forcing becomes better aligned for strengthening northwest onshore flow area wide, with gusty winds developing this afternoon into the evening hours, especially for higher elevations and channeled valleys. There's some uncertainty in just how far the marine layer will progress inland tonight into early Thursday morning. A drier airmass in the wake of the cold front and easing winds after midnight may somewhat limit the marine layer's inland progress despite the marine layer slightly strengthening just offshore.

LONG TERM

Issued at 1140 PM PDT Tue Jun 2 2026 (Thursday through Tuesday)

Not much change in the extended forecast with only subtle variations in daytime highs Thursday and Friday, especially inland. We begin feeling the influence of the deepening trough along the Pacific Coastline later in the day on Friday. H85 temps peak in the low 20s(C) Thursday and Friday and are down to around 14C-16C for the weekend into next week, which will result in surface temperatures around 5-10 degrees below normal for the weekend into the beginning of next week. There is a signal for some potential unimpactful light rain later Monday into Tuesday, there is poor consensus in deterministic guidance evolves the timing and position of the trough. However, ensemble guidance provides high confidence in the overall synoptic troughing persisting beyond the current extended forecast.

MARINE

(Today through Monday) Issued at 1125 AM PDT Wed Jun 3 2026

Gale force gusts are building across the northern waters and the coastal jet regions. Seas build through the day, becoming rough tomorrow and into the weekend. Conditions will slowly begin to improve into the early work week.

MTR WATCHES/WARNINGS/ADVISORIES

CA...None. PZ...Small Craft Advisory from 3 PM this afternoon to 3 AM PDT Thursday for Mry Bay-SF Bay N of Bay Bridge.

Gale Warning until 3 AM PDT Friday for Pt Arena to Pt Reyes 0-10 nm-Pt Arena to Pt Reyes 10-60 NM.

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

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

Gale Warning until 9 AM PDT Thursday for Pt Pinos to Pt Piedras Blancas 0-10 nm.

Small Craft Advisory until 3 AM PDT Friday for Pigeon Pt to Pt Pinos 10-60 NM.