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Extreme Heat Warning: Santa Ana Mountains and Foothills to Face 100°F

An Extreme Heat Warning has been issued for the Santa Ana Mountains and Foothills, with temperatures up to 100°F expected from tonight, October 3, until Thursday, October 8. Residents should drink fluids, stay in air-conditioned areas, and never leave children or pets in cars.

Staff Writer
10/03/2026 · Anaheim edition

Residents in the Santa Ana Mountains and Foothills are advised to take immediate precautions as an Extreme Heat Warning has been issued by the National Weather Service San Diego CA. The warning is effective from tonight, October 3, at 9:40 PM PDT, and will remain in effect until Thursday, October 8, at 8:00 PM PDT.

Dangerously hot conditions are expected, with temperatures reaching up to 100 degrees Fahrenheit. Nighttime lows will also be elevated, staying in the low to mid 70s, offering little relief from the heat.

Heat-related illnesses significantly increase during extreme heat events. To stay safe, the National Weather Service strongly recommends drinking plenty of fluids, staying in air-conditioned rooms, and avoiding direct sun exposure. Residents should also check on relatives and neighbors, especially those who may be vulnerable to the heat.

It is critical to remember: Do not leave young children or pets in unattended vehicles. Car interiors can reach lethal temperatures rapidly, posing an extreme danger.

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