Valleys and deserts in Riverside County were expected to reach triple-digit temperatures Sunday ahead of possible thunderstorms next week, forecasters said.

A heat advisory issued by the National Weather Service is in effect between 11 a.m. and 7 p.m. in the valleys and the San Gorgonio Pass near Banning where temperatures are expected to range from 97 to 104 degrees.

“Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances,” the NWS advised.

Sunday’s highs were expected to reach 114 degrees in Thermal, 112 degrees in Palm Springs, 101 in Riverside, 96 in Temecula, 94 in Moreno Valley and 88 in Idyllwild.

Monsoonal moisture is expected to begin building Sunday afternoon, potentially causing thunderstorms to develop over the mountains, according to the NWS.

While the moisture will bring cooler weather Monday and Tuesday, it will also increase the chances of more widespread showers and thunderstorms across the county, with the mountain and desert areas expected to be the heaviest hit, forecasters said.

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