A heat wave is set to strike Southern California starting Monday, with temperatures expected to soar well into triple digits throughout Riverside County until Wednesday.

The National Weather Service issued an excessive heat warning for the Coachella Valley, San Gorgonio Pass near Banning and Riverside County Mountains and valleys starting at 10 a.m. and lasting until 8 p.m. Tuesday. High temperatures of 113 to 118 degrees were expected in the Coachella Valley, while the Inland Empire was expected to reach between 105 to 110 degrees.

The brief heat wave wasn’t expected to see temperatures as high as the previous heat wave that ran from July 23-27. That heat wave set several record high temperatures with the heat peaking at 122 degrees in Thermal and 121 degrees in Palm Springs, according to the NWS.

High temperatures Monday were expected to reach 112 degrees in Thermal, 112 degrees in Palm Springs, 103 in Riverside, 102 in Temecula and 113 in Indio, forecasters said.

Nighttime lows will be in the high 80s in the lower deserts, meaning the minimal cooling at night could pose a health risk to those who don’t have access to air conditioning because the body needs time to cool down from the day’s heat, according to the NWS.

The combination of hot days and warm nights was expected to increase the threat of heat illness, and the NWS urged residents and guests to drink plenty of fluids, stay out of the sun and check up on relatives and neighbors.

Never leave a child, senior or pet in a parked vehicle, even with the windows cracked, as interior temperatures can quickly turn lethal.

Temperatures were expected to cool slightly on Wednesday, when monsoonal moisture is expected to return with a slight chance of thunderstorms, forecasters said.

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