textproduct: San Francisco Bay Area

KEY MESSAGES

Updated at 1232 PM PDT Sun Aug 30 2026

- Slight chance for coastal drizzle during the night and morning hours through Tuesday morning

- Cooling trend continues through at least midweek

SHORT TERM

Issued at 1232 PM PDT Sun Aug 30 2026 (This evening through Monday night)

Stratus has retreated to the coast as of early afternoon with mostly sunny skies across the interior. Thus, temperatures inland temperatures will warm into the 70s to mid 80s and the lower 90s across the far interior. Meanwhile, persistent onshore flow and the marine layer will maintain cooler conditions near the coast, generally reaching into the 60s.

The marine layer is likely to deepen overnight to around 2000 feet and with an increased potential for coastal drizzle tonight and into midmorning on Monday. Expecting a slower clearing of stratus Monday morning as troughing off of the Pacific Northwest coast develops and deepens. As such, afternoon maximum temperatures will be 5 to 15 degrees below average. Heading into Monday night, another round of night/morning drizzle is expected along the coast and in the favored upslope regions.

LONG TERM

Issued at 1232 PM PDT Sun Aug 30 2026 (Tuesday through next Saturday)

Tuesday is now forecast to be the coolest day of the week with afternoon temperatures some 10 to 20 degrees below normal for this time of year. Temperatures remain below seasonal averages throughout much of next week with the potential for rain particularly across the North Bay late week as a weak frontal boundary sags southward across the region. This is as a cut-off low develops off of the northern California coast Tuesday with troughing persisting through the remainder of the week and potentially into next weekend. Still keeping an eye on the tropical eastern Pacific as it remains fairly active for any moisture that may be brought northward into California.

AVIATION

(18Z TAFS) Issued at 1143 AM PDT Sun Aug 30 2026

Widespread VFR with clear skies prevails this afternoon as moderate onshore winds increase. The marine layer was about 200 feet deeper this morning compared to yesterday (1400 ft to 1600 ft) and will continue to deepen tonight, resulting in MVFR ceilings at most terminals. Low confidence on whether stratus will reach the interior East and South Bay valley terminals, therefore the TAF hints at the potential with SCT decks. Coastal sites develop low-end MVFR ceilings around sunset, meanwhile the rest of the sites develop MVFR ceilings overnight. Stratus should recede to the coast by late Monday morning. Overall, medium confidence on the exact arrival of stratus.

Vicinity of SFO...VFR prevails this afternoon with moderate westerly breezes. Decreased potential for strong gusts this afternoon, though cannot fully rule out an occasional 20 kt gust. As winds ease overnight, MVFR stratus is expected to develop at both SFO and OAK which then persist until late Monday morning as moderate winds increase.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...Northwest to west winds prevail through the TAF period. VFR conditions this afternoon with medium confidence for MVFR ceilings to develop right before sunset, though they may arrive as late as 9 PM PDT tonight. Stratus persists overnight with the potential for coastal drizzle early Monday morning. If coastal drizzle occurs, anticipate a reduction to visibility around 4-6SM.

MARINE

(Today through Friday) Issued at 918 AM PDT Sun Aug 30 2026

Northwest breezes remain fresh with strong to near gale force gusts today and gradually diminish to gentle breezes by Monday. Wind driven rough seas subside to moderate by Monday into the rest of the week. The long period southerly swell also decreases today into early Monday morning.

MTR WATCHES/WARNINGS/ADVISORIES

CA...None. PZ...Small Craft Advisory until 3 AM PDT Monday for Pt Arena to Pt Reyes 0-10 nm.

Small Craft Advisory until 9 PM PDT this evening for Pigeon Pt to Pt Pinos 10-60 NM-Pt Pinos to Pt Piedras Blancas 0-10 nm.

Small Craft Advisory until 9 AM PDT Monday for Pt Arena to Pt Reyes 10-60 NM.