Extreme Heat Warning — Update
NWS San Diego CA
Archived copy, taken Fri, Aug 28, 2026, 8:20 PM PDT. Read this alert at the National Weather Service →
Extreme Heat Warning issued August 28 at 11:46AM PDT until August 29 at 8:00PM PDT by NWS San Diego CA
- Issued
- Fri, Aug 28, 2026, 11:46 AM PDT
- Effective
- Fri, Aug 28, 2026, 11:46 AM PDT
- Ends
- Sat, Aug 29, 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 today with temperatures of 103 to 107 degrees. Hot conditions continue into Saturday with high temperatures up to 103 degrees. Lows will be in the mid 70s to low 80s.
- WHERE...San Bernardino and Riverside County Valleys-The Inland Empire.
- WHEN...Until 8 PM PDT Saturday.
- IMPACTS...Heat related illnesses increase significantly during extreme heat events.
- ADDITIONAL DETAILS...Temperatures will fall to below normal by Sunday.
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.