textproduct: San Francisco Bay Area

KEY MESSAGES

Updated at 1255 AM PDT Thu Jun 4 2026

- Breezy to gusty onshore winds mainly in the afternoon and evening

- Notable cool down for the weekend through the middle of next week

SHORT TERM

Issued at 1255 AM PDT Thu Jun 4 2026 (Today and tonight)

Strong mid to upper level high pressure i.e. 500 mb height 589 decameters and moderate northerly 6.7 mb ACV-SFO and onshore 3.4 mb SFO-SAC surface pressure gradients prevail early this morning. The marine layer depth varies from 1000 feet to locally 2000 feet. The surface pressure gradients and cool air advection are producing gusty wind flow trapped beneath the upper level high's lower level temperature inversion with a varying focus of onshore winds through the coastal gaps.

With early June solar input and the close proximity of the lower level temperature inversion with the strong mid to upper level high pressure system, daytime high temperatures will warm back up above normal today. Forecast highs today upper 60s to lower 70s coastside to the 80s and 90s far inland.

LONG TERM

Issued at 1255 AM PDT Thu Jun 4 2026 (Friday through Wednesday)

With strong mid to upper level high pressure prevailing Friday, daytime highs will warm back up to above normal with warmest to hottest inland temperatures reaching the 80s and 90s. On Saturday the upper level high will begin to weaken, daytime highs will begin to trend lower with inland highs mainly in the 70s and 80s. Sunday's temperatures will be a repeat of Saturday's temperatures.

Additional cooling Monday through Wednesday will lower daytime high temperatures a few more degrees with 70s well inland except in the 80s southern interior. Recent GFS and to some extent the ECMWF have been showing a trough arriving with some measurable rainfall early next week. With a strong late season meridional temperature gradient, ongoing negative (cool) phase Pacific Decadal Oscillation and moisture tap back to the western Pacific, it'll be interesting to see if e.g. the recently wetter solution GFS verifies.

AVIATION

(06Z TAFS) Issued at 1007 PM PDT Wed Jun 3 2026

Stratus is returning along the coastline and will become more widespread overnight. Highest confidence in stratus reaching HAF, MRY, SNS, OAK, and SFO with lower confidence in it reaching STS and APC. Largely expecting MVFR to IFR CIGs with some potential for LIFR CIGs directly along the coastline. Winds will gradually ease overnight with breezy winds returning during the afternoon/evening. Moderate confidence on timing and placement of stratus tomorrow night with guidance not in a clear consensus as to either how extensive it will be and the general timing. For right now, highest confidence that stratus will return tomorrow night along the coast but it may potentially spread into the SF Bay as well.

Vicinity of SFO...Gusty winds continue to ease overnight but are expected to remain moderate (10-15 knots) through late morning. Another round of gusty onshore winds is expected during the afternoon/evening but gusts peaks will peak lower than they did today with gusts to peak around 30 knots. A band of stratus was able to push through the San Bruno Gap this evening and bring IFR conditions to SFO. Moderate confidence that stratus and MVFR-IFR conditions will persist at SFO through the remainder of the night.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...MVFR-IFR conditions tonight with some potential for LIFR conditions to develop during the early morning hours. Not anticipating fog to develop tonight but minor reductions in visibility are possible. Winds continue to ease overnight before moderate (10-15 knots) onshore winds return during the afternoon/evening. Stratus is likely to return again tomorrow evening but confidence on the exact timing is low. Guidance does not have a clear consensus for tomorrow night's stratus. The earliest likely return of stratus would be from 03-06Z so have started hedging towards that in the TAF.

MARINE

(Tonight through next Tuesday) Issued at 1007 PM PDT Wed Jun 3 2026

Hazardous conditions for small craft continue through the weekend. Near gale to force winds are expected along the coastal jet regions and outer waters through this weekend. Rough seas between 10 to 15 feet continue through this weekend. Winds decrease and seas abate heading into early next week.

MTR WATCHES/WARNINGS/ADVISORIES

CA...None. PZ...Small Craft Advisory until 3 AM PDT Thursday for Mry Bay-SF Bay N of Bay Bridge.

Small Craft Advisory from 3 PM to 9 PM PDT Thursday for Mry Bay.

Gale Warning until 9 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 3 AM PDT Friday 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 9 AM PDT Friday for Pigeon Pt to Pt Pinos 10-60 NM.