Extreme Heat Watch
NWS San Diego CA
Archived copy, taken Wed, Sep 30, 2026, 5:21 AM PDT. Read this alert at the National Weather Service →
Extreme Heat Watch issued September 30 at 3:05AM PDT until October 7 at 9:00PM PDT by NWS San Diego CA
- Issued
- Wed, Sep 30, 2026, 3:05 AM PDT
- Effective
- Wed, Sep 30, 2026, 3:05 AM PDT
- Ends
- Wed, Oct 7, 2026, 9:00 PM PDT
- Severity
- Severe
- Urgency
- Future
- Certainty
- Likely
- Status
- Actual
- Message type
- Alert
AreaSan Diego County Coastal Areas; San Bernardino and Riverside County Valleys-The Inland Empire; San Diego County Inland Valleys; Santa Ana Mountains and Foothills; Orange County Coastal; Orange County Inland
- WHAT...Dangerously hot conditions with high temperatures on the hottest days ranging from around 90 near the coast to the upper 90s to 108 for the valleys possible. Low temperatures for coastal areas into the western valleys will warm into the lower to mid 70s during the weekend with those warm overnight temperatures continuing for next week.
- WHERE...Orange County Coastal Areas, Orange County Inland Areas, San Bernardino and Riverside County Valleys-The Inland Empire, San Diego County Coastal Areas, San Diego County Valleys, and Santa Ana Mountains and Foothills.
- WHEN...From Friday morning through Wednesday evening.
- IMPACTS...Heat related illnesses increase significantly during extreme heat events.
- ADDITIONAL DETAILS...A long-duration heat wave is expected to develop late this week and continue through much of next week into the following weekend with Moderate or greater HeatRisk for the coast and valleys and Major to Extreme HeatRisk for inland coastal areas into the western valleys.
What the Weather Service says to do
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.