Sunrise on Tuesday from Lyons Peak east of Jamul. Image from HPWREN camera network

Another heat wave is expected to grip San Diego County this week, but it will not be as hot or last as long or as record-breaking as the one last week, according to the National Weather Service.

High pressure will remain over the southwestern United States before moving southward into Mexico starting on Friday, forecasters said. This will keep temperatures hot in most areas through Thursday, then highs will gradually fall over the weekend.

The weather agency issued an excessive heat warning from 10 a.m. Tuesday through 8 p.m. Thursday in the county deserts.

High temperatures Wednesday are forecast to reach 84 degrees near the coast, 92 inland, 96 in the western valleys, 100 near the foothills, 102 in the mountains and 118 in the deserts.

The mercury in the deserts is expected to reach 117 on Thursday, then drop to 113 on Friday, forecasters said. Highs in the western valleys are expected to remain in the low-to-mid-90s through Thursday, while temperatures near the foothills could reach the triple digits through Friday.

Meteorologists urged residents to drink plenty of fluids, stay out of the sun and check on relatives and neighbors. Also, children, seniors and pets should be never be left unattended in a vehicle, with car interiors able to “reach lethal temperatures in a matter of minutes.”

To help the public beat the heat, the county is offering nine cooling centers in Alpine, Borrego Springs, Fallbrook, Lakeside, Potrero, Ramona, Santa Ysabel, Spring Valley and Valley Center. Due to the coronavirus, mandatory mask- wearing and social-distancing protocols are enforced in the facilities.

A full list of the cooling center locations can be found online.

Updated at 4:10 a.m., Wednesday, Aug. 26, 2020

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Chris Jennewein

Chris Jennewein is Editor & Publisher of Times of San Diego.