Alert archive / California / Excessive Heat Warnings

Excessive Heat Warnings in California, 2023

30 excessive heat warnings in 2023. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of excessive heat warnings reaches back to 2005.

Excessive Heat Warnings by county

Each county as a circle sized by its count in 2023. Tap one for its archive.

Excessive Heat Warnings
30
Busiest month
July12 excessive heat warnings
Busiest day
June 29, 20234 excessive heat warnings

Over time

By month

The alerts

Every alert, in the order issued. Times are local, Pacific Time. Each opens its own page with the text, the map, the radar and the sounding.

IssuedProductOfficeCountiesLasted
Jun 28, 11:26 AM PDTExcessive Heat WarningSTO4 days
Jun 28, 11:46 AM PDTExcessive Heat WarningHNXFresno, Kern, Kings, Madera, Mariposa, Merced and 1 more4 days
Jun 29, 11:49 AM PDTExcessive Heat WarningPSRImperial, Riverside, San Bernardino30 days
Jun 29, 12:39 PM PDTExcessive Heat WarningVEFInyo, San Bernardino4 days
Jun 29, 1:25 PM PDTExcessive Heat WarningSGXRiverside, San Bernardino, San Diego4 days
Jun 29, 1:35 PM PDTExcessive Heat WarningLOXLos Angeles, San Luis Obispo4 days
Jul 8, 1:46 PM PDTExcessive Heat WarningVEFInyo, San Bernardino15 days
Jul 8, 2:21 PM PDTExcessive Heat WarningSGXOrange, Riverside, San Bernardino, San Diego15 days
Jul 11, 1:50 PM PDTExcessive Heat WarningLOXLos Angeles, San Luis Obispo, Santa Barbara, Ventura6 days
Jul 11, 11:23 PM PDTExcessive Heat WarningHNXFresno, Kern, Kings, Madera, Mariposa, Merced and 1 more6 days
Jul 12, 9:50 AM PDTExcessive Heat WarningSTO5 days
Jul 12, 1:37 PM PDTExcessive Heat WarningMTRAlameda, Contra Costa, Marin, Monterey, Napa, San Benito and 4 more4 days
Jul 12, 1:43 PM PDTExcessive Heat WarningEKALake, Mendocino, Trinity4 days
Jul 19, 12:26 PM PDTExcessive Heat WarningHNXFresno, Kern, Kings, Madera, Mariposa, Merced and 1 more4 days
Jul 20, 3:17 AM PDTExcessive Heat WarningLOXLos Angeles, San Luis Obispo, Santa Barbara, Ventura3 days
Jul 24, 1:44 AM PDTExcessive Heat WarningPSRImperial, Riverside, San Bernardino6 days
Jul 24, 3:02 AM PDTExcessive Heat WarningSGXRiverside, San Diego6 days
Jul 24, 2:26 PM PDTExcessive Heat WarningVEFSan Bernardino5 days
Aug 2, 12:40 AM PDTExcessive Heat WarningPSRImperial, Riverside, San Bernardino6 days
Aug 4, 2:53 AM PDTExcessive Heat WarningSGXRiverside, San Diego4 days
Aug 11, 1:32 PM PDTExcessive Heat WarningMFRSiskiyou6 days
Aug 13, 6:03 AM PDTExcessive Heat WarningEKAHumboldt, Lake, Mendocino, Trinity4 days
Aug 14, 12:24 PM PDTExcessive Heat WarningPSRImperial, Riverside3 days
Aug 14, 7:08 PM PDTExcessive Heat WarningSGXRiverside, San Diego3 days
Aug 25, 11:43 AM PDTExcessive Heat WarningPSRImperial, Riverside, San Bernardino5 days
Aug 25, 1:30 PM PDTExcessive Heat WarningSGXRiverside, San Bernardino, San Diego5 days
Aug 25, 1:37 PM PDTExcessive Heat WarningVEFSan Bernardino4 days
Aug 26, 1:57 PM PDTExcessive Heat WarningLOXLos Angeles, Santa Barbara, Ventura3 days
Sep 7, 1:19 AM PDTExcessive Heat WarningPSRImperial, Riverside4 days
Sep 7, 2:33 AM PDTExcessive Heat WarningSGXRiverside, San Diego3 days

By county

Every county with at least one alert. A county page lists each alert that covered it.

The busiest days

Days with the most alerts issued, by UTC date.

  1. June 29, 20234excessive heat warnings
  2. July 12, 20234excessive heat warnings
  3. July 24, 20233excessive heat warnings
  4. August 25, 20233excessive heat warnings
  5. June 28, 20232excessive heat warnings
  6. July 8, 20232excessive heat warnings
  7. September 7, 20232excessive heat warnings
  8. July 11, 20231excessive heat warnings
  9. July 19, 20231excessive heat warnings
  10. July 20, 20231excessive heat warnings
  11. August 2, 20231excessive heat warnings
  12. August 4, 20231excessive heat warnings

Nearby

Alerts in force nowTornadoes on recordThe radar archive20222024

Sources

National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.