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Extreme Heat Watch issued September 30 at 3:05AM PDT until October 7 at 9:00PM PDT by NWS San Diego CA, United States of America

severe

Severity as published by WMO Alert Hub (national weather services).

Source

WMO Alert Hub (national weather services) — official source

Time

30 September 2026, 10:05 UTC (Sep 30, 2026)

Area

San Diego County Coastal Areas; San Bernardino and Riverside County Valleys-The Inland Empire; San Diego County Inland Valleys; Santa Ana Mountains and Foo, United States
39.965, -100.811

What this is

This is an official warning issued by the authority named above. Follow its instructions and those of your local emergency services.

What to do

Follow the instructions issued by WMO Alert Hub (national weather services) and your local emergency services. The guidance below is background.

Recognising heat exhaustion and heat stroke, keeping cool, and protecting vulnerable people during extreme heat.
Full heatwave safety guide

Who to contact

National Weather Service · FEMA · USGS Earthquake Hazards

This site is not an emergency service and does not issue warnings.

Location

No map is loaded here. A map means downloading image tiles from another service, which is the slowest thing on the full page and the first thing to fail on a weak connection. The coordinates are above if you need them.