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WHAT: High temperatures 97 to 104 and low temperatures 65 to 75 expected, with widespread Moderate HeatRisk and areas of Major HeatRisk.
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WHERE: The central and southern Sacramento Valley, northern San Joaquin Valley, Delta and Carquinez Strait, Foothills, and portions of the Coast Range.
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WHEN: From 10 AM Wednesday to 10 PM PDT Thursday.
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IMPACTS: Hot temperatures may cause heat illnesses, especially to anyone without effective cooling and/or adequate hydration.
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ADDITIONAL DETAILS: Hottest temperatures and areas of Major HeatRisk are now expected to occur on Wednesday. Warmest overnight lows are expected in the Sierra foothills thermal belts.
* WHAT...High temperatures 97 to 104 and low temperatures 65 to 75 expected, with widespread Moderate HeatRisk and areas of Major HeatRisk. * WHERE...The central and southern Sacramento Valley, northern San Joaquin Valley, Delta and Carquinez Strait, Foothills, and portions of the Coast Range. * WHEN...From 10 AM Wednesday to 10 PM PDT Thursday. * IMPACTS...Hot temperatures may cause heat illnesses, especially to anyone without effective cooling and/or adequate hydration. * ADDITIONAL DETAILS...Hottest temperatures and areas of Major HeatRisk are now expected to occur on Wednesday. Warmest overnight lows are expected in the Sierra foothills thermal belts.
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Ozone is forecast to reach 101 AQI - Unhealthy for Sensitive Groups on Wed 09/09/2026.
Active children and adults, and people with lung disease, such as asthma, should reduce prolonged or heavy exertion outdoors
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