Extreme Heat Warning for San Diego County Inland Valleys
This alert is no longer in effect.
NOAA issued it on September 9, 2026, 12 days ago. Warnings of this kind stay in effect for hours to a few days, so this page is a historical record of what was issued, not a current warning. For conditions where you are right now, check weather.gov (US), weather.gc.ca (Canada), the Met Office (UK), or the Bureau of Meteorology (Australia).
Areazine synthesizes this NWS weather alert directly from NOAA's official public data feed. See our methodology for full source attribution and refresh cadence.
An Extreme Heat Warning is in effect for San Diego County Inland Valleys until 8 PM PDT September 9, with dangerously hot conditions and high temperatures up to 107 expected.
Read this weather record in 30 seconds
- Record type
- Extreme Heat Warning
- Affected area
- San Diego County Inland Valleys
- Issued
- September 9, 2026
- Issuing authority
- NWS San Diego CA
Heat notices are time-bound and location-specific. Confirm the current forecast and local public-health guidance before relying on this archived record.
Record status: historical. It was issued 12 days ago; use the issuing agency's live warning service for current conditions in San Diego County Inland Valleys.
Alert Details
Extreme Heat Warning issued by NWS San Diego CA. Effective from 2026-09-09T02:58:00-07:00 until 2026-09-09T20:00:00-07:00. Severity: Severe. Certainty: Likely. Urgency: Expected.
Affected Areas
San Diego County Inland Valleys (San Diego County Valleys).
What You Should Do
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Expected Conditions
Dangerously hot conditions with high temperatures in the mid 90s to 107 and low temperatures in the 70s expected. Major to Extreme HeatRisk. Warm overnight temperatures will limit relief from the heat. Heat related illnesses increase significantly during extreme heat events.
Timeline
Alert effective starting 2026-09-09T02:58:00-07:00 and ends 2026-09-09T20:00:00-07:00.
Original source: NOAA Official Notice ↗
Related Weather Alerts
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Two cross-category peer sets, both computed from Areazine's own archive: notices with a similar body length, and notices near the same severity and agency date. These are drawn from other categories, not the same-feed Related list above.
Similar body length
Nearest notices by article body length (816 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to September 9, 2026.
Common Questions
What people usually ask about a notice like this one.