After months of extended dry conditions, the San Francisco Bay Area will receive its first fall rainfall starting Tuesday. Intermittent showers are forecasted to persist through at least Thursday morning as a Pacific weather system moves across the region, according to the National Weather Service.
Meteorologists attribute this shift to a low-pressure system moving inland from the Pacific Ocean. Along with the moisture, the system will bring cooler daytime temperatures and potential flooding concerns, particularly along the Central Coast and surrounding elevated terrain.
Expected Rainfall Totals Across the Bay Area
Precipitation levels will vary significantly by location across the multi-county region. Most of the standard Bay Area footprint is forecast to receive light to moderate accumulations ranging between 0.05 and 0.15 inch, according to National Weather Service meteorologist Matt Mehle.
However, localized areas with higher elevations can expect higher totals. The Santa Cruz Mountains and parts of the East Bay could see rainfall amounts reach up to 0.25 inch. Meanwhile, regions located farther to the south may encounter substantially heavier downpours as the system progresses.
Timeline of the Pacific Storm System
Light showers are projected to hit the Central Coast by Tuesday morning before expanding northward into urban centers. San Francisco could experience its initial precipitation by Wednesday morning, with intermittent showers potentially lingering into Thursday.
- Tuesday Morning: Initial light showers arrive along the Central Coast.
- Wednesday Morning: Precipitation reaches San Francisco and the immediate bay shoreline.
- Thursday: Intermittent showers taper off with lingering cooler air masses.
Emergency officials and transit agencies remind local commuters to exercise caution on regional roadways. Early-season storms frequently mix with accumulated oils on asphalt, creating slick driving conditions following months of dry weather.
