The mercury will soar into the triple digits across parts of San Diego County later this week, prompting the National Weather Service to issue an Extreme Heat Watch for the region.
The Extreme Heat Watch for San Diego County mountains and deserts begins at 10 a.m. Thursday and concludes to 8 p.m. Friday. However, temps are expected to remain elevated through the weekend.
“Drink plenty of fluids, stay in air-conditioned rooms and stay out of the sun,” the NWS said. “Heat-related illnesses increase significantly during extreme heat events.”
High temperatures Tuesday are expected to reach 78 near the coast, 78 to 83 inland, 81 to 86 in the western valleys, 88 to 93 near the foothills, 86 to 95 in the mountains and 106 to 110 in the deserts.
Along with the increasing heat later this week, chances for monsoonal thunderstorms will occur starting Thursday into at least early next week for inland areas. Take a look below for more info on who could see a storm or two ⛈️ #CAwx pic.twitter.com/fzRthO3I2L
— NWS San Diego (@NWSSanDiego) August 18, 2025By Thursday, mountain highs will climb past 100 degrees, with a slight chance of afternoon showers and thunderstorms, according to the weather agency. Desert temperatures are forecast to remain above 110 on Thursday and Friday, with a chance of rain.
San Diego County will stay hot this weekend, with above-average lows limiting relief from the heat. Monsoonal moisture could spark afternoon thunderstorms over the mountains and deserts through the weekend.
City News Service contributed to this article.
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