textproduct: San Francisco Bay Area

KEY MESSAGES

Updated at 1125 AM PDT Mon Apr 13 2026

- Slightly cooler to near normal temperatures through Thursday

- Periods of gusty winds, especially at higher elevations Wednesday through Friday

- Warmer temperatures return Friday and Saturday before unsettled weather returns for early next week

SHORT TERM

Issued at 1125 AM PDT Mon Apr 13 2026 (This afternoon through Tuesday)

Lingering rain showers persist over the Pacific late this morning with these forecast to diminish through the afternoon and evening. The RRFS (rapid refresh forecast system) and other CAMs (convection- allowing models) indicate the potential for isolated rain showers across the higher terrain of the southern Diablo Range and Santa Lucia Range this afternoon, diminishing as the sunsets. Otherwise, mostly dry conditions return to the region this afternoon with afternoon temperatures forecast to be in the upper 50s to low 60s near the coast and low-to-upper 60s across the interior. However, the highest peaks may not reach much above the upper 40s to low 50s.

Tonight, temperatures will be chilly across the interior North Bay Valleys and interior Central Coast with mid-to-upper 30s expected. There is a low end potential for frost, yet widespread coverage in not currently anticipated. Elsewhere, temperatures will range from the low 40s to near 50 degrees F (warmest near the coast).

For Tuesday, expecting dry conditions with temperatures warming regionwide by a few degrees as a shortwave ridge builds in wake of the exiting trough.

LONG TERM

Issued at 1125 AM PDT Mon Apr 13 2026 (Tuesday night through next Sunday)

Additional warming is expected on Wednesday, but only again by a few degrees. All of this is ahead of an approaching frontal boundary that is forecast to be mostly dry. However, there are chances across far northern Napa and Sonoma counties Wednesday afternoon and evening, generally less than 25%. This said, there very well may be light precipitation as far south as the Central Coast as the front moves across the region late Wednesday evening and into early Thursday morning. Little to no measurable rainfall expected with this system.

In wake of this system, offshore winds are forecast to be strongest across the North Bay Mountains and East Bay hills Thursday and into Friday. This will be as the exiting system shifts into the Great Basin and/or Intermountain West. There still is some uncertainty with the exact track of this system, thus less confidence in the strength of offshore winds. However, widespread wetting rainfall across the region has greatly reduced fire weather concerns (at least in the short term).

Weak ridging will build in behind the aforementioned system on Friday and Saturday with temperatures returning to near seasonal averages along with dry weather. Unsettled weather looks to return late Saturday and into early next week as another mid/upper level trough drops out of the Gulf of Alaska and approaches the West Coast.

AVIATION

(00Z TAFS) Issued at 444 PM PDT Mon Apr 13 2026

Fair weather cumulus continue to linger across the Bay Area, although the coverage is gradually decreasing as the sun angle starts to increase. There is a chance for MVFR ceilings across all terminals overnight, but the probability varies depending on location. Otherwise winds will remain onshore while gradually decreasing to a gentle breeze overnight.

Vicinity of SFO...Strong onshore winds will gradually ease through the evening hours. The biggest question is if SFO will get a ceiling overnight. GFSLAMP guidance shows a 20-30% chance of MVFR ceilings between 12Z and 16Z. Even if ceilings do form Tuesday morning, there is enough instability to virtually eliminate the risk of anything lower than MVFR conditions. More likely any cloud bases will be in the VFR range.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...The best chances for ceiling impacts are at MRY and SNS overnight. With a reforming deep marine layer, there is very little chance for anything lower than 1,500 feet however.

MARINE

(Tonight through next Saturday) Issued at 444 PM PDT Mon Apr 13 2026

Rain showers linger through the morning before diminishing into the afternoon. Winds stay light through early afternoon, increasing to a moderate to fresh northwesterly breeze through Wednesday. Winds build again on Thursday leading to near gale force gusts into the end of the work week. Moderate seas continue through Wednesday before rough seas arrive on Thursday.

MTR WATCHES/WARNINGS/ADVISORIES

CA...None. PZ...Small Craft Advisory until 3 AM PDT Wednesday for Pt Arena to Pt Reyes 0-10 nm-Pt Arena to Pt Reyes 10-60 NM.

Small Craft Advisory until 3 AM PDT Tuesday for Pt Reyes to Pigeon Pt 0-10 nm.

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

Small Craft Advisory from 3 PM Tuesday to 3 AM PDT Wednesday for Pt Pinos to Pt Piedras Blancas 0-10 nm.