Extreme Heat Warning — Update
NWS San Diego CA
Archived copy, taken Thu, Sep 10, 2026, 6:00 AM PDT. Read this alert at the National Weather Service →
Extreme Heat Warning issued September 10 at 4:00AM PDT until September 10 at 8:00PM PDT by NWS San Diego CA
- Issued
- Thu, Sep 10, 2026, 4:00 AM PDT
- Effective
- Thu, Sep 10, 2026, 4:00 AM PDT
- Ends
- Thu, Sep 10, 2026, 8:00 PM PDT
- Severity
- Severe
- Urgency
- Expected
- Certainty
- Likely
- Status
- Actual
- Message type
- Update
AreaSan Bernardino and Riverside County Valleys-The Inland Empire
- WHAT...Dangerously hot conditions with high temperatures in the upper 90s to 108 expected.
- WHERE...San Bernardino and Riverside County Valleys-The Inland Empire.
- WHEN...Until 8 PM PDT this evening.
- IMPACTS...Heat related illnesses increase significantly during extreme heat events.
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.
Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.