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Southern California heat wave

Updated 3 times since CLSTR started tracking revisions of this situation.

What changed

2026-10-02 06:39 UTC → 2026-10-02 21:12 UTC · added removed

Southern California has faced a prolonged and dangerous heat wave characterized by triple-digit temperatures. Initially, the National Weather Service issued extreme heat watches for regions including Orange, Riverside, and Santa Barbara counties, warning of a high-pressure dome that could drive temperatures above 100 degrees in inland valleys and deserts. This period also brought increased wildfire risks and potential public safety power shut-offs in areas like Moreno Valley. As the event progressed, the National Weather Service upgraded alerts to Extreme Heat Warnings for coastal and valley areas of Los Angeles and Orange counties. In Los Angeles County, valley temperatures were forecast to reach between 90 and 105 degrees, while Saturday was projected to be the hottest day with valley temperatures potentially ranging from 100 to 107 degrees. In Orange County, inland areas were expected to see highs near 100 degrees. In Santa Barbara County, the Health Department issued a health alert following National Weather Service warnings covering south coast communities, the interior wilderness, and the Cuyama Valley. Forecasts indicated temperatures reaching up to 85 degrees at the coast and 100 degrees in the mountains and Cuyama Valley, with some periods seeing highs of 103 degrees. Health officials warned of elevated fire conditions and urged residents to prevent heat exhaustion and heat stroke by staying hydrated and seeking air-conditioned environments, noting that electric fans may not prevent illness when temperatures exceed the high 90s. As the The heat wave continues is forecast to sweep across Southern California persist from Friday through at least next Thursday. The combination of high temperatures, low humidity, and the Bay Area, Santa Ana winds has significantly increased wildfire risks. Consequently, utility companies are preparing for potential Public Safety Power Shutoffs (PSPS) to mitigate wildfire risks. Edison International is considering preventive cuts for approximately 9,990 customers in Riverside County, while (PSPS). San Diego Gas & Electric Co. has flagged potential outages for over more than 35,000 customers in mountain foothill communities. at-risk communities, while Edison International is considering preventive shutoffs for nearly 10,000 customers in Riverside County.

Versions

  1. 2026-10-02 21:12 UTC Southern California heat wave
  2. 2026-10-02 06:39 UTC Southern California heat wave
  3. 2026-10-02 01:20 UTC Southern California heat wave
  4. 2026-10-01 22:20 UTC Southern California heat wave

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