textproduct: San Francisco Bay Area

KEY MESSAGES

Updated at 1047 PM PDT Mon Apr 27 2026

- Morning stratus and fog returns to the forecast!

- Warming and drying trend continues into the late week for areas away from the coast.

- Cooler conditions return this weekend with a chance of rain

SHORT TERM

Issued at 1047 PM PDT Mon Apr 27 2026 (Tonight through Wednesday)

The evening still had a few areas of rain in the northernmost portions of Sonoma Co, but it looks like they have mostly diminished. Drizzle chances linger for some of the coast and mountaintops districtwide overnight, while the valleys see good chances for fog building in the late night and lingering into the mid morning.

The steady warming trend continues for Tuesday with most areas getting close to average, though slightly below. Coastal areas will peak around 60 degrees while areas inland will see the upper 60s to mid 70s. Interior mountains will still be dealing with lingering moisture, so they'll still be on the cool side with some struggling to break 50 degrees in on the Big Sur Coast.

The warming comes from a building ridge to the north, but a cut off low to the south will prevent too much of a warm up, especially for the coastal areas. The low looks to offer just enough influence over the area that the marine layer stays intact through the week, and keep conditions breezy over the marine environment and immediate coast. This marine influence won't spread too far inland, so the more interior areas will see more of a steady warming until the pattern changes this weekend.

Wednesday sees high temperatures along the coast plateauing: still around 60 degrees. Areas inland will continue warming and get back above average with the more interior areas getting into the upper 70s and a few spots breaking 80.

Overnight lows will also see a slight warming trend, with most areas seeing lows in the 50s by the mid week.

LONG TERM

Issued at 1047 PM PDT Mon Apr 27 2026 (Wednesday night through next Monday)

The inland warming trend looks to peak on Friday with the 80s expected across the interior areas and maybe a few 90s in the southern Salinas Valley. This will be while the coast will continue to stick to the 60s under the influence of good coastal breezes, the marine layer, and nightly marine stratus. The areas slightly inland will be a mixed bag. Those that see the marine layer and stratus look to only warm into the mid 70s, while areas that will be just outside of the marine influence will lean closer to 80 degrees. It'll be the kind of day where you drive from Half Moon Bay to San Jose and experience around a 20 degree difference.

A trough and low approach the region into Friday night, increasing cloud cover and expanding the marine layer both in height and inland push. Models are going back to the solution hinted at a few nights ago, with this low causing another drizzle-fest with some scattered light rain. The timing of the best rain chances is still not firm across models, but for now it does look better for drizzle in the mid-weekend with measurable rain arriving Late Sunday and into the next work week. Welcome to May-Gray!

AVIATION

(06Z TAFS) Issued at 1023 PM PDT Mon Apr 27 2026

Generally VFR conditions at present, with MVFR stratus expanding across the coastal valleys through the night. Stratus will dissipate Tuesday morning with gentle to moderate onshore pattern winds developing in the afternoon hours, with stratus beginning to develop on Tuesday evening, although the highest probabilities of stratus development at the terminals fall after the end of the 24-hour TAF period.

Vicinity of SFO... VFR with some low clouds for the next few hours, with MVFR stratus developing early Tuesday morning before dissipating later that morning. Moderate west-northwest winds will develop in the afternoon and evening hours before diminishing in the late evening. High resolution models depict stratus flowing across the Golden Gate late Tuesday evening, with low confidence of impacts to the terminal itself before the end of the TAF period. Greater confidence in earlier impacts at OAK.

SFO Bridge Approach... Similar to SFO.

Monterey Bay Terminals... MVFR ceilings will develop overnight before diminishing in the later hours of Tuesday morning. Gentle to moderate northwest winds Tuesday afternoon and evening, otherwise light drainage flow persists in the overnight and morning hours.

MARINE

(Tonight through next Sunday) Issued at 1023 PM PDT Mon Apr 27 2026

High pressure off the Pacific Northwest coast and low pressure inland will maintain northwesterly flow over the coastal waters. Moderate to fresh breezes will develop Tuesday as high pressure strengthens. These stronger winds will build rough seas of 8-12 feet across exposed waters later in the week.

MTR WATCHES/WARNINGS/ADVISORIES

CA...None. PZ...Small Craft Advisory from 3 PM Tuesday to 3 PM PDT Wednesday for Pt Arena to Pt Reyes 10-60 NM.