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Heat Advisory Issued for Mendocino and Lake Counties Today

A Heat Advisory is in effect today, October 4, for parts of Mendocino and Lake counties, with temperatures up to 101 degrees and high heat illness risk; residents should drink fluids, stay cool, and check on others.

Staff Writer
10/04/2026 · Clearlake edition

Residents in Southwestern Interior Mendocino, Southeastern Interior Mendocino, Western Lake, Southwestern Lake, and Eastern Lake counties should prepare for a Heat Advisory in effect today, October 4.

The National Weather Service (NWS) in Eureka, CA, issued the advisory at 3:02 AM PDT, which remains in effect until 11:00 PM PDT this evening. High temperatures are expected to reach up to 101 degrees Fahrenheit, with overnight temperatures remaining above 65 degrees. This forecast indicates a moderate to localized high HeatRisk.

The NWS warns that these conditions increase the potential for heat-related illnesses. To mitigate these risks, residents are advised to drink plenty of fluids, stay in air-conditioned rooms, stay out of the sun, and check on relatives and neighbors.

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