A heat wave across the San Francisco Bay Area and Central Coast brought temperatures well above normal on September 9, 2026, with daytime highs and overnight lows forecast 6–11°C (10–20°F) above normal and widespread Moderate to Major HeatRisk across the region. The National Weather Service (NWS) said the heat would persist through September 10, with inland highs reaching approximately 32–41°C (90–105°F), while the Bay Area Air District issued a Spare the Air Alert as ground-level ozone was forecast to reach unhealthy levels in parts of the Bay Area.
Bay Area heat wave brings temperatures up to 11°C (20°F) above normal, unhealthy air quality, and Major HeatRisk, California
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