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.

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