The mercury is expected to soar into the triple digits in downtown Riverside and surrounding locations Sunday, prompting the National Weather Service to issue a heat advisory.

The advisory will be in effect from 10 a.m. Sunday to 8 p.m. Monday, covering most of western Riverside County and the lower half of San Bernardino County.

“Take extra precautions if you work or spend time outside,” the NWS stated. “When possible, reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion.”

The high in the Riverside metropolitan area was expected to peak just under 100 degrees Saturday, exceeding 100 on Sunday and Monday, according to forecasters. Lows aren’t likely to fall below the mid-70s Saturday night to Monday night.

Highs on Saturday were expected to be up to 12 degrees above average for this time of year, the NWS said.

High pressure has stalled over Nevada and is influencing regional weather patterns, ushering in brittle dry, hot conditions, meteorologists said.

“As the high pressure centers over the Great Basin, this opens the door for easterly monsoonal flow to enter Southern California,” the NWS said. “Slight chances of thunderstorms (are) in the forecast for the mountains and deserts on Monday afternoon and evening.”

In the Coachella Valley, the highs will hover around 110 through the weekend and into early next week, with lows generally in the low 80s.

In the Temecula Valley, where the heat advisory also applies, highs will be in the mid-90s Sunday and Monday, with lows in the upper 60s, according to the NWS.

A list of cooling centers in Riverside County can be found at

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