By Reginald Stanley. Posted August 24, 2026, 10:20 PM.

The Extreme Heat Watch previously issued by the National Weather Service for a large portion of Southern California from 10 AM Tuesday until 8 PM Friday, has been upgraded to an Extreme Heat Warning covering the same timeframe.

The difference between both advisories is mainly due to the increased heat threat, with temperatures in areas under the Extreme Heat Warning now forecast to reach up to 110 degrees during the peak of the heat wave. In addition, this also raises the risk for heat-related illnesses across affected populations. Very warm nights, with low temperatures significantly above average, will provide little to no relief from the excessive daytime heat. The Heat Advisory currently in effect across much of the region, will remain in place until 10 AM Tuesday with no changes. As a reminder, the National Weather Service cautions the public to drink plenty of fluids, stay out of the sun and in an air-conditioned room if/when possible, and check up on relatives and neighbors.