Excessive Heat — San Bernardino and Riverside County Valleys - the Inland Empire, California

2024-09-03 to 2024-09-10 · San Bernardino and Riverside County Valleys - the Inland Empire, California

Event narrative

Extreme heat started September 3 and continued through September 10, 2024. The hottest days were September 5 to 8, when high temperatures reached 105 to 114F across the entire Inland Empire. Despite scattered thunderstorms on September 7 and 8th, the high temperatures were still around 110F at many locations in the Inland Empire.

Wider weather episode

A heat wave developed starting Labor Day weekend and peaked the next weekend September 5 to 9, 2024. The hottest days included Ramona reaching 114, Santa Ana 113, and Anaheim an all-time record of 112.

Source: NOAA Storm Events Database, event_id 1219626. Narrative written by the NWS forecast office that issued the report.