textproduct: San Francisco Bay Area

KEY MESSAGES

Updated at 1200 AM PDT Sat May 23 2026

- Diurnally driven onshore winds during the afternoon and early evening through the early part of next week

- Gradual cooling trend begins today with seasonal temperatures for the upcoming weekend and cooler temperatures early next week, followed by warming into the mid week

SHORT TERM

Issued at 1028 AM PDT Sat May 23 2026 (This afternoon through Sunday)

Another deep marine layer setup with plenty of cloud cover pushing inland this morning. The passing weak low pressure will keep stratus mixing around the coast, but the areas inland will see the lower clouds erode quickly in the sun.

The North Bay looks to keep cloud cover longer than previous days due to this low, leading to a delayed warm up for the interior valleys and overall cooler conditions.

Highs today will range from the 50 along the coast, 60s for areas more inland, 70s for the more interior areas, and into the lower 80s for the far interior. This will be coupled with a fair amount of humidity retention during the day, and great recoveries overnight. The deep marine layer and more of and inland push of the marine air will keep most of the overnight lows in the 50s, with only the far interior falling into the 40s.

Sunday will offer largely similar conditions, with slightly earlier clearing times for that inland North Bay cloud cover. Overall high temperatures will be slightly cooler, but only by a few degrees.

LONG TERM

Issued at 1028 AM PDT Sat May 23 2026 (Sunday night through next Friday)

The marine layer deepens into Sunday night and will push even farther inland by Memorial Day, leading to widespread cloud cover. This will also cause slower clearing for the interior, and the potential for little to no clearing along the coast. Expect cool coastal conditions under cloudy skies with highs in the 50s. Then the areas slightly inland will hover around the mid to lower 60s, and the far interior will be in the 70s. Only a few portions of the far interior look to break 80.

The next pattern change looks to arrive Tuesday with a low pressure moving down the coast. Longer models have slight disagreements on the track of this low, and unfortunately those differences affect the Bay Area a good amount. If this low pushing inland to the north of the Bay Area, dry off shore flow will cause a jump up in temperatures, not to hazardous levels, but a notable increase. If the low focuses over the SF Bay, chances for drizzle along with continued cooling. The there's a chance the low builds far inland and becomes a cut-off low, giving a uniform, yet weaker, offshore flow. The current forecast follows the first resolution listed, leading to a warmer Tuesday for the Bay Area, but continued cooling for areas to the south. This will be followed by a warming and drying trend for the rest of the work week. Luckily, after that initial jump in temperatures, the rest of the warming trend looks to be gradual. But much can change in the mid to long term forecast, so be sure to keep checking in!

AVIATION

(00Z TAFS) Issued at 426 PM PDT Sat May 23 2026

VFR conditions will prevail for the remainder of the afternoon and early evening. A deep marine layer will bring primarily MVFR stratus cigs back for all terminals this evening through late Sunday morning with VFR for the remainder of the TAF period once stratus lifts.

Vicinity of SFO...VFR through later tonight with MVFR cigs expected between 06-09z and persisting through late Sunday morning. Expect SW-W winds up to 15kts at times Sunday afternoon and evening.

SFO Bridge Approach...Similar as SFO.

Monterey Bay Terminals...MVFR stratus is expected to return after sunset tonight and persist through at least late Sunday morning. Expect breezy KSNS winds out of the west/northwest for the remainder of this afternoon and once again Sunday afternoon.

MARINE

(Tonight through next Thursday) Issued at 426 PM PDT Sat May 23 2026

Winds and seas diminish and hold through early Tuesday morning. An incoming trough is set to approach our waters late Monday night, bringing strong northwesterly winds and building rough seas next week.

MTR WATCHES/WARNINGS/ADVISORIES

CA...None. PZ...None.