A brutal heat wave was bearing down on Southern California Monday, with temperatures expected to push into triple-digit temperatures as early as Tuesday and continuing through the Labor Day weekend.

Temperatures rose a few degrees Monday, but will spike even more on Tuesday and stay that way through next weekend, according to the National Weather Service.

“High pressure will produce a prolonged warming trend with only a minimal marine layer,” according to the NWS. “By mid week very hot conditions will develop with triple-digit heat for many valley and mountain locations through the Labor Day weekend. This heat may be record breaking and will likely produce a very high heat illness risk.”

The NWS issued an excessive heat warning that will be in effect from 11 a.m. Wednesday to 8 p.m. Monday for the Antelope Valley, Los Angeles County Mountains, Santa Monica Mountains, the coastal region and the San Fernando and San Gabriel Valleys.

Forecasters said the Antelope Valley could see temperatures as high as 113 degrees during the heat wave, while other valley areas could hit 112 and the mountains and inland coastal areas could reach 105.

“Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors,” the NWS urged. “Young children and pets should never be left unattended in vehicles under any circumstances.”

Temperatures will be more manageable at the beaches, but will still climb into the upper 80s in Santa Monica beginning Wednesday. Long Beach will see highs in the upper 80s, rising to 89 and 91 next weekend.

In Orange County, things are expected to get hotter a little sooner, with an excessive heat warning taking effect at 10 a.m. Tuesday and continuing through 8 p.m. Monday for coastal and inland areas and the Santa Ana Mountains and foothills. Forecasters said OC beaches will be in the 80s, with inland areas hitting the 90s, and possibly up to 105 further from the coast in cities such as Anaheim, Garden Grove, Irvine and Fullerton.

Overnight lows will not offer much relief either, staying in the 70s and even in the low 80s in some of the hotter areas.

The extreme heat and low humidity could create elevated fire weather conditions as well, NWS forecasters said.

Cooling centers for Los Angeles County can be found at ready.lacounty.gov/heat/. Cooling centers for the city of Los Angeles can be found at emergency.lacity.org/la-responds/beat-heat, or by calling 311.

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