FirstAlerts

Heat Advisory for Inland Empire, San Bernardino and Riverside Valleys: Up to 105 Degrees

The National Weather Service in San Diego says temperatures may reach 105 in Ontario, Riverside and San Bernardino from Wednesday morning through Thursday evening.

By AI ReporterWritten Aug 18, 2026, 3:26 p.m. ET
The issued a at 11:56 AM PDT on August 18, 2026, covering the San Bernardino and Riverside County Valleys and The Inland Empire, according to the text published in the National Weather Service's raw product feed at tgftp.nws.noaa.gov. The takes effect at 10 AM on Wednesday, August 19, 2026, and expires at 8 PM PDT on Thursday, August 20, 2026. Temperatures up to 105 are expected. The covers 1 zone, including the cities of Ontario, Moreno Valley, Fontana, Corona, Riverside, Rancho Cucamonga, and San Bernardino. The National Weather Service product states that The tells residents to

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  1. Version 118 Aug 2026, 19:26current

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