Active Weather Alerts
Heat Advisory
Issued: 10:47 AM Sep. 23, 2025 – National Weather Service
...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 7 PM PDT THIS EVENING... * WHAT...Temperatures up to 100 degrees for parts of the East Bay, mid to upper 90's across portions of the San Francisco Bay Shoreline and the Santa Clara Valley. Mid to upper 80's over eastern portions of San Francisco. * WHERE...The East Bay and San Francisco Bay Shoreline, The Santa Clara Valley, and San Francisco. * WHEN...From 11 AM this morning to 7 PM PDT this evening. * IMPACTS...Hot conditions can cause heat illnesses. This level of heat affects most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration. Impacts possible in some health systems and in heat-sensitive industries. This level of heat affects anyone without effective cooling and/or adequate hydration. Impacts likely in some health systems, heat-sensitive industries and infrastructure. * ADDITIONAL DETAILS...The warmest part of the day for the city of San Francisco and adjacent San Francisco Bay Shoreline will be late morning through mid-afternoon when a return of weak onshore flow is expected to bring some relief. PRECAUTIONARY/PREPAREDNESS ACTIONS... Hydration is a critical piece to surviving the heat. Drink water, and if possible, take water to those who are vulnerable. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to the early morning or evening. Take action when you experience symptoms of heat exhaustion and/or heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. Beat the heat and check the backseat! Do not leave young children or pets in unattended vehicles.Car interiors will reach lethal temperatures in a matter of minutes. &&
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