San Francisco started today with mostly clear skies and temperatures near 55°F. That brief calm is on the clock as a strong Pacific low moves in, set to push steady rain into the Bay Area today and keep showers in the forecast through Wednesday, with the wettest periods expected this afternoon and again Tuesday when thunderstorms are possible.
What To Expect Today
Light showers could sneak in early, then steadier rain with pockets of heavier downpours will spread across the region through the day, with showers or embedded thunderstorms likely by the afternoon commute. Highs are expected to reach the mid-60s before slipping into the low 60s once the rain and southerly flow arrive, and new rainfall amounts of about a quarter to a half inch are on the table for many neighborhoods. The National Weather Service is calling for a high chance of precipitation today and is also flagging gusty southerly winds; check the latest guidance from NWS San Francisco.
Afternoon Winds And Commute
Southerly winds will ramp up this afternoon, generally running in the single digits to mid-teens with gusts into the mid-20s and, in favored coastal and ridgeline spots, gusts that could reach the 25 to 40 mph range. That wind, paired with wet roads, will likely slow the evening commute and make biking or walking across bridge approaches more hazardous. Drivers should plan on slower travel, reduced visibility in heavier showers, and standing water in low-lying areas.
Tuesday Thunderstorm Risk
Tomorrow is the more unsettled day, with showers and thunderstorms expected in the afternoon and evening. Any storms that develop could produce lightning, brief heavy downpours, and small hail. Total rainfall through Wednesday is expected to land between about a half inch and an inch and a half in lower elevations, with up to 3 inches possible in the coastal ranges and North Bay interior mountains, so minor urban or poor-drainage flooding is possible in a few spots. The timing and expected amounts are drawn from the latest guidance for the San Francisco and Monterey forecast area; keep an eye on updates from NWS San Francisco.
Boaters And Ferry Riders
Small craft advisories are in effect for parts of San Francisco Bay and Monterey Bay, and waters will turn choppy with southerly gusts this afternoon and evening. Mariners, paddle-craft users, and ferry riders should consider postponing nonessential outings and watch for rapidly changing conditions near channel entrances and exposed shorelines.
Plan Ahead
Plan on a waterproof layer, some extra travel time today and Tuesday, and secure any loose outdoor gear that can go airborne in the gusts.
