Sunrise from Otay Mountain on a hot day. Filephoto from UCSD HPWREN camera network

A heat wave will bring sweltering temperatures to San Diego County’s deserts, mountains and western valleys next week, the National Weather Service said Thursday.

The weather service issued an adivsory of “dangerously hot” triple-digit conditions that will go into effect at 10 a.m. Monday and extend to 9 p.m. next Friday.

Forecasters said temperatures of 113 to 118 degrees are possible in the deserts throughout next week, with highs in the mountains and western valleys topping 100 at mid week.

“High pressure building into the region this weekend into next week will lead to a long duration heat wave, likely peaking Tuesday through Thursday,” according to the weather service.

Coastal areas of San Diego will will mostly escape the heat due to a shallow marine layer.

The extreme heat will significantly increase the potential for heat-related illnesses, particularly for those working or participating in outdoor activities.

Residents of affected areas were urged to monitor the latest forecasts and warnings for updates.

People should be prepared to drink plenty of fluids, stay in an air-conditioned room, stay out of the sun and check up on relatives and neighbors.

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Chris Jennewein

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