SAN FRANCISCO, Calif. – A potent Pacific system is on track to sweep into the Bay Area by midweek, bringing strong southerly winds, periods of heavy rain, and a small chance for thunderstorms. The North Bay faces the greatest threat for more than an inch of rain and wind gusts above 40 mph by Wednesday, raising the risk for downed trees, scattered power outages, and slick roadways.
According to the National Weather Service in San Francisco, widespread rainfall is expected to develop from late Tuesday through Wednesday night as a deep Pacific trough moves inland. Probabilities for over one inch of rain exceed 70% in San Francisco and Marin counties, while thunder chances—near 20%—center over the North Bay. Lightning and gusty outflow winds could briefly intensify showers, especially near coastal hills and higher terrain.
Transportation officials warn that travel could be hazardous during the Wednesday morning and evening commutes. Drivers on U.S. 101, I-280, and I-80 should anticipate ponding on roads, reduced visibility, and possible lane closures from minor flooding. PG&E crews are preparing for isolated outages, particularly in wind-prone valleys and ridgelines.
Residents are urged to secure outdoor items, clear storm drains, and keep electronic devices charged. When thunder roars, move indoors immediately. Conditions should ease by early Thursday as the system shifts eastward, leaving cooler, damp air across the region into the weekend.
Five-Day Forecast for San Francisco, CA:
Sun: 63/52 – Partly cloudy, light breeze.
Mon: 64/54 – Increasing clouds; light rain possible late north of city.
Tue: 62/55 – Breezy with showers developing; gusts 25–30 mph.
Wed: 60/53 – Windy, periods of rain; isolated thunder, minor flooding risk.
Thu: 61/50 – Showers tapering early; cooler, partly sunny later.
