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Southern California’s mini heat wave peaks, advisories expire early

Temperatures inched upward again Wednesday as a mini heat wave settled over the region, with slight cooling on tap for Thursday and near-normal conditions anticipated by the weekend.

The heat pushed well into the 90s in many areas Wednesdays, which forecasters said would be the peak of the small heat wave.

National Weather Service forecasters said only slight cooling was anticipated for Thursday, but heat advisories that had been expected to continue until Thursday night in the Santa Monica Mountains Recreational area, Calabasas, Agoura Hills, San Fernando Valley, Santa Clarita Valley, San Gabriel Valley and Los Angeles County coastal area stretching to downtown Los Angeles were instead allowed to expire at 5 p.m. Wednesday.

People look for shade as temperatures soared once again on Wednesday, May 21, 2025, at Lake Balboa. Some cooling was expected Thursday with more relief over the Memorial Day weekend. (Photo by Gene Blevins/Contributing Photographer)

“No heat advisories are in effect Thursday,” NWS officials confirmed.

“High pressure aloft will remain dominant over the region through Thursday, but does not look as potent as before,” according to the NWS, which predicted high temperatures of 85 to 95 degrees.

Onshore flow will increase Thursday and Friday, bringing a return of the marine layer by Friday and quickly bringing down temperatures to more normal levels. A “big cooling” is on tap for Saturday.

“This cooling will bring most coast/valley areas down to a few degrees below normal,” according to the NWS. “The strong onshore flow will bring gusty winds to the mountains, the Central Coast and the western Antelope Valley and foothills.”

Forecasters said a slight bump up in temperatures is anticipated Sunday.

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