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Heat in San Bernardino and Riverside County Valleys - the Inland Empire, California
Heat August 22, 2025 · San Bernardino and Riverside County Valleys - the Inland Empire, California
What the National Weather Service wrote
Tied daily record high temperature of 107 at San Jacinto.
The wider storm
An upper level high pressure system allowed for a combination of above average temperatures and high humidity to produce an elevated heat risk for inland areas August 20-24. This was locally enhanced by heat bursts produced by shower activity in the coastal and valley areas on the afternoon of August 23.
Source: NOAA Storm Events Database, event 1293497. Narratives are written by the National Weather Service forecast office that issued the report.
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