Late-Summer Heat Wave To Scorch Inland San Diego County

SAN DIEGO, CA — Temperatures soared Wednesday as a late-summer heat wave moved into inland San Diego County.

The expected onset of scorching conditions prompted the National Weather Service to issue an extreme heat warning from 10 a.m. Wednesday until 8 p.m. Saturday for the county deserts. Dangerously hot conditions with temperatures up to 116 degrees are expected.

Meanwhile, a heat advisory was issued from 10 a.m. Wednesday until 8 p.m. Friday for the mountains and valleys. Temperatures are expected up to 103 degrees for the inland valleys, according to the NWS.

Thursday and Friday are expected to be the hottest days.

"Heat-related illnesses increase significantly during extreme heat events," forecasters warned.

Weather officials advised residents to drink plenty of fluids, stay in air-conditioned rooms, stay out of the sun, and check on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances.

• Also see: Where To Find A Cool Zone As Heat Wave Scorches San Diego County

Forecasters said the heat wave will be followed by a gradual cooling trend.

"High pressure across the southwest states will continue the warming trend with the heat peaking on Thursday and Friday," officials said. "This will be followed by a gradual cooling trend with temperatures returning to around average on next Tuesday. Monsoonal moisture will begin to increase on Thursday with chances for afternoon and early evening showers and thunderstorms for the mountains and deserts beginning on Friday and continuing into next week."