The record heat wave will continue on Friday in San Diego County, but a cooling trend is beginning, and only the deserts will remain hot by Sunday, according to the National Weather Service.
“The marine layer and onshore flow will maintain comfortable summer weather along the coast and in the far western valleys, with night and morning low clouds and patchy fog, while hot weather prevails farther inland,” the weather service said.
Skies will clear throughout the region by Friday afternoon, with the deserts potentially reaching 122 degrees and the mountains expected to reach 103.
On Thursday, Borrego Springs hit 118 degrees, besting its previous record for June 17 of 114 degrees, set in 2008.
Highs elsewhere on Friday are expected to be 72 to 77 near the coast, 79 to 84 inland, 82 to 87 in the western valleys and 90 to 95 near the foothills.
City News Service contributed to this article.