SAN DIEGO — Temperatures will soar into the triple digits in San Diego-area mountain and desert communities through the week, as more moderate summertime conditions prevail in coastal and inland-valley locales, forecasters said.
Maximum thermometer readings in Borrego Springs and other parts of the arid eastern reaches of the county are expected to climb steadily over the workweek before topping out as high as 120 degrees by Sunday, according to the National Weather Service. In the mountains, temperatures could reach 108, the agency advised.
Not only will daytime temperatures be sweltering over the period in the hottest spots, but overnight lows will be significantly elevated, especially in the low deserts, according to the NWS.
Due to the predicted extreme heat, Cedar Creek Falls, Eagle Peak trails, the San Diego River Gorge and Three Sisters Falls have been closed until further notice, according to Cleveland National Forest officials.
The NWS advised people in the hottest locations to drink plenty of fluids, stay out of the midday sun and check up on potentially at-risk relatives and neighbors over the course of the heat wave.
Additionally, "young children and pets should never be left unattended in vehicles under any circumstances," the agency advised.
Daytime highs are excepted to ascend into the 90s in the inland valleys over the period, while mercury readings along the coast should max out in the high 70s Thursday and dip down a few degrees by the weekend, according to meteorologists.
Weather alerts
An Excessive Heat Warning has been extended through Tuesday, July 18. In addition to the extension on time, the warning has also been extended to now include San Diego County inland valleys.
Excessive Heat Warning | San Diego County Inland Valleys starts at 10:00 a.m. on July 14 and expires on July 18 at 8:00 p.m.
Excessive Heat Warning | San Diego County Mountains expires July 18 at 8:00 p.m.
Excessive Heat Warning | San Diego County Deserts expires July 19 at 11:00 p.m.
Cool zones
San Diego County's Cool Zone program offers free air conditioning at locations across the county.
Here's a list of places where you can escape the extreme heat.
Know the signs
WATCH RELATED: Incoming heat wave closes popular inland hiking trails
