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Extreme Heat Warning Issued for San Diego Coastal Areas

An Extreme Heat Warning is in effect for San Diego County Coastal Areas until Thursday, October 8 at 8:00 PM PDT, with dangerously hot conditions and warm nights expected; residents should take precautions against heat-related illnesses.

Staff Writer
10/03/2026 · Chula Vista edition

Residents in San Diego County Coastal Areas should prepare for dangerously hot conditions as an Extreme Heat Warning has been issued by the National Weather Service San Diego CA. This warning is effective immediately, beginning October 3 at 9:40 PM PDT, and will remain in effect until Thursday, October 8 at 8:00 PM PDT.

High temperatures are expected to range from the mid-80s to mid-90s along the beaches, escalating to the mid-90s and low-100s in mesa areas. Nights will offer little relief, with low temperatures mostly remaining in the 70s. The National Weather Service emphasizes that heat-related illnesses increase significantly during such extreme heat events.

To mitigate risks, residents are advised to drink plenty of fluids, stay in air-conditioned rooms, and stay out of the sun. It is crucial to check on relatives and neighbors, especially those vulnerable to heat. Never leave young children or pets in unattended vehicles, as car interiors can reach lethal temperatures rapidly. This warning specifically applies to San Diego County Coastal Areas.

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