Another heat wave settled into Southern California Sunday, with temperatures expected to linger in the 90s and low triple digits in some areas through Wednesday.

An excessive heat warning was issued from 10 a.m. Monday until 8 p.m. Wednesday for the valley areas, according to the National Weather Service, and from 10 a.m. Monday until 8 p.m. Tuesday for downtown Los Angeles and Beverly Hills, Compton, Culver City, Downey, Hollywood, Lakewood and Norwalk.

A heat advisory was in effect from 10 a.m. Monday until 8 p.m. Tuesday in the Los Angeles County beach areas.

“Temperatures will be hottest on Monday and Tuesday when highs push into the 90s to around 105 degrees across the interior coastal plain, valleys, mountains, and deserts,” according to the NWS. “The coastal and inland valleys of Los Angeles County and nearby Ventura County will be especially warm with excessive heat conditions likely on those days.”

Sunday’s expected high in downtown Los Angeles was 89 degrees, increasing to 91, 92 and 92 again over the following three days, the NWS said.

Van Nuys was expected to reach 99 on Sunday, 101 Monday and Tuesday and 100 on Wednesday. Pasadena was predicted to reach 95 on Sunday, 97 on Monday, 98 on Tuesday and 97 again Wednesday.

In Orange County, forecasters also issued excessive heat watches that will be in place Monday morning through Wednesday evening for inland and coastal areas. According to the NWS, temperatures could reach triple-digits inland in cities such as Santa Ana, Anaheim, Irvine and Fullerton, while coastal areas could reach into the 90s.

“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,” the NWS advised. “Young children and pets should never be left unattended in vehicles under any circumstances.”

Overnight lows are also forecast to be higher than normal for the next few days, lingering in the low-to-mid 70s in the inland areas.

Daytime temperatures are expected to drop a few degrees Thursday before settling back into the 80s on Friday.

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