Sweltering conditions are expected Monday throughout Riverside County, but temperatures will cool off the rest of the week, according to the National Weather Service.
An excessive heat warning will be in effect until 9 p.m. Monday in the Riverside County mountains, the San Gorgonio Pass near Banning and the Coachella Valley.
A heat advisory covering the Riverside metropolitan area will also be in effect until 9 p.m. Monday.
But cooler temperatures will arrive on Tuesday, and thunderstorms will be possible in the mountains, San Gorgonio Pass and Coachella Valley each afternoon from Tuesday through Thursday, forecasters said.
The mercury on Monday could hit 117 degrees in the Coachella Valley, 101 to 108 in the valleys and Inland Empire, and 95 to 105 in the Riverside County mountains, according to the NWS.
The weather service said the extreme heat will significantly increase the potential for heat-related illnesses, particularly for those working or participating in outdoor activities.
People should be prepared to drink plenty of fluids, stay in an air-conditioned room, stay out of the sun and check up on relatives and neighbors.
While young children and pets should never be left unattended in vehicles under any circumstances, the weather service said that’s especially true during warm or hot weather — when car interiors can reach lethal temperatures in a matter of minutes.
The county recently opened cooling centers in multiple locations, where residents who don’t have access to air-conditioning can stay during the heat of the day. A complete list of options is available at www.capriverside.org/cool-centers.