National Weather Service United States Department of Commerce

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

San Francisco Bay Area, CA

Weather Forecast Office

NWS Forecast Office San Francisco, CA

Weather.gov > San Francisco Bay Area, CA
Click a location below for detailed forecast.

Last Map Update: Thu, Aug 27, 2026 at 6:36:17 pm PDT

Risk for Thunderstorms on Friday
Critical Fire Weather Threat due to Lightning
Red Flag Warning in effect from 5am Friday to 3pm Friday with isolated lightning strikes. Gusty outflow winds of 40 to 50mph with the strongest storms. Most likely area for thunderstorm activity across Central Coast and Santa Cruz Mountains. Be sure your emergency kit is ready and listen to local officials for any evacuation instructions.
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Isolated (10-30% chance) dry thunderstorms (≤ 0.10 inches of rainfall) producing abundant lightning over receptive vegetation. New wildfire starts are the primary threat with extreme fire behavior and rapid rates of spread likely on new and existing wildfires due to erratic and gusty outflow winds.
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