textproduct: San Francisco Bay Area

KEY MESSAGES

Updated at 1139 PM PDT Sun Apr 5 2026

- Cooler into the work week

- Beneficial rain arrives in the mid week and lasts into the weekend

- Slight chances for storms Thursday and Friday

SHORT TERM

Issued at 1139 PM PDT Sun Apr 5 2026 (Tonight through Tuesday)

It was the warmest day of the week with highs mostly in the 80s and a daily high temperature record broken at Livermore. Temperatures look to steadily cool into the night with the dropping pressure allowing the marine layer to rebuild. Low stratus has been slowly building along the coast and spreading from the North to South since sunset. Most coastal areas and some of the interior valleys look to see low clouds and fog chances into the early morning through the mid morning. Low temperatures will be slightly cooler tonight.

The increase in moisture from the rebuilding marine layer and better onshore flow will make for a much cooler Monday. High temperatures in most areas will be around 10 degrees cooler than Sunday afternoon! The immediate coast looks to peak around 60 degrees while the inland areas span the 60s and 70s. Only the far interior areas look to break the 80 degree mark, but just barely.

The cooling trend will affect Monday night's temperatures as well, with lows falling back into the 40s for the more inland areas and around 50 for the coastal areas.

LONG TERM

Issued at 1139 PM PDT Sun Apr 5 2026 (Tuesday night through next Sunday)

High temperatures stay mostly the same for Tuesday and Wednesday as onshore flow says fairly persistent and the marine continues to deepen. Wednesday night does see a bit of warm up in a few areas as the warm-sector ahead of the next low pressure system begins to affect the area.

The evening model updates have slowed the arrival of the low pressure and trough combo heading our way in the . The warmer air ahead of it will foster some drizzle chances into Wednesday evening along the coast and across the northern portions of the North Bay counties. These chances become more widespread later into that night. Measurable, but still very light, rain has mostly been pushed back to the mid to late morning on Thursday for the Bay Area and Central Coast. These chances for light showers look to be off and on through Saturday morning, but there is still potential for the low to slow and precip chances lingering into that night.

The mixing environment around the low will offer slight chances for storms both Thursday afternoon and Friday afternoon. Friday shows more widespread chances than Thursday, but it will be something for forecasters to keep an eye on as the low can still change trajectory and shift around these storm chances.

Even though the low pressure exits Saturday, cloud cover and onshore flow look to last into the next work week. This will keep things on the cool side into the end of the forecast period.

AVIATION

(12Z TAFS) Issued at 414 AM PDT Mon Apr 6 2026

Compressed marine layer over the coastal waters oozed inland overnight. Marine layer is approx 1k or less. Dissipation this morning will be in the 16-18Z most areas with VFR this afternoon. Early return this evening for coastal sites and after 03Z in SF Bay.

Vicinity of SFO...Cams and sat show low cigs hugging the gap at the moment inching SE. Will keep cigs in TAF based on trends, but confidence is low to moderate. Clouds clear late morning. VFR this afternoon. Cigs return this evening during tail end of PM rush.

SFO Bridge Approach...VFR. Cigs more likely NW and NE.

Monterey Bay Terminals...Solid shallow marine layer with cigs lingering through 18Z. VFR this afternoon and early return late this afternoon/early this evening.

MARINE

(Today through Saturday) Issued at 414 AM PDT Mon Apr 6 2026

High pressure off the California coast will maintain light to moderate breezes across the coastal waters through week. Locally fresh breezes will briefly develop along the Big Sur coast Monday afternoon and strongest south of Point Sur. Unsettled weather returns mid to late week, bringing light showers, a slight chance of thunderstorms, and moderate seas. Winds increase next weekend with a fresh breeze expected over the northern coastal waters.

MTR WATCHES/WARNINGS/ADVISORIES

CA...None. PZ...Small Craft Advisory from 3 PM this afternoon to 3 AM PDT Tuesday for Pt Pinos to Pt Piedras Blancas 0-10 nm.