San Francisco Weather Alert: Bay Area Faces Heavy Rain and Flood Risk Early Next Week
SAN FRANCISCO, CALIFORNIA — A slow-moving Pacific storm system is forecast to bring heavy rainfall and flash flooding concerns to parts of the Bay Area and Central Coast early next week. The National Weather Service (NWS) said a Marginal Risk for excessive rainfall has been issued for Monday and Tuesday, indicating at least a 5% chance of rain intense enough to trigger localized flooding.
Storm Setup and Affected Areas
According to the Weather Prediction Center and the NWS San Francisco Bay Area office, the risk zone includes San Francisco, Oakland, San Jose, Santa Rosa, Monterey, and the Highway 1 corridor through Big Sur. Forecasters expect periods of moderate to heavy rain to develop late Sunday night and continue through early Tuesday morning.
Urban flooding, clogged drains, and small stream flooding may occur in low-lying and poorly drained areas, while hillside communities could experience minor runoff or debris flow issues, especially in burn scar regions.
Travel and Safety Warnings
Transportation officials are urging commuters to prepare for slippery roads and slower travel Monday and Tuesday, particularly along I-280, US-101, and Highway 17, where ponding and reduced visibility are likely. The NWS also advises keeping storm drains and gutters clear ahead of the storm and to avoid driving through standing water.
“Heavy rainfall rates could overwhelm drainage systems for short periods,” forecasters warned, emphasizing the long-standing safety message: “Turn Around, Don’t Drown.”
Forecast Outlook and Midweek Conditions
By Tuesday afternoon, the Pacific system is expected to move eastward, allowing drier and cooler air to return by midweek. High temperatures will fall back into the 60s with clearer skies. However, another weak system may approach the coast late next week, bringing the potential for more showers.
Meteorologists say this early-season rainfall will provide much-needed moisture to the region but may also cause travel disruptions and localized flooding if heavier bands develop inland.
Stay with NapervilleLocal.com for continuing weather alerts, forecasts, and safety updates across California and the Midwest.
I’ve lived in Naperville long enough to see how quickly our community changes — from new developments downtown to sudden shifts in our Midwest weather. Reporting on Naperville news and daily forecasts gives me the chance to keep neighbors informed about what really matters. My goal is simple: deliver clear, timely updates so you always know what’s happening in our city and what to expect from the skies above.