The Southland was sweltering under an early-summer heat wave this weekend, with temperatures reaching triple-digits in some valley communities and posing a health threat.

Saturday’s high reached 89 degrees in downtown Los Angeles, 99 in Pasadena, 105 in Van Nuys and 104 in Palmdale and Lancaster.

In neighboring Orange County, Fullerton was expected to reach 100 degrees by mid-afternoon, according to the National Weather Service.

The NWS attributed the hot weather to a strong upper level high centered over Arizona and New Mexico. It will expand westward through Sunday before weakening somewhat on Monday.

A heat advisory was in effect until 8 p.m. Sunday in the San Fernando, San Gabriel and Santa Clarita valleys, both the San Gabriel and Santa Monica mountains, and inland Orange County and the Santa Ana mountains.

The NWS forecast temperatures of 100-110 in the Antelope Valley on Saturday, 95-105 in L.A. County’s other valleys and 92-102 in the mountains and foothills.

The weather service urged area residents to stay hydrated by drinking plenty of water, confining strenuous work or exercise to early morning or evening hours, and wearing lightweight clothing.

And, it stressed, “never, ever, leave children, elderly and pets in an enclosed car, even with the windows down during this heat.”

Sunday will be the heat wave’s warmest day, with highs of 101 forecast in Woodland Hills and 106 in Palmdale and Lancaster.

A slight cooling trend is expected to begin Monday, but temperatures in the 90s will last at least through Thursday in some valley areas, forecasters said.

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