Temperatures will continue to rise in Riverside County Thursday, with extreme heat expected in the Coachella Valley and the San Gorgonio Pass near Banning heading into Labor Day Weekend.

The National Weather Service issued an excessive heat watch that will be in effect from Friday morning through Saturday evening in those two areas.

High pressure will continue to build over the southwest Thursday, then center itself over the Four Corners region this weekend and usher in monsoonal moisture through Wednesday, forecasters said.

The mercury in the Coachella Valley is expected to reach 110 on Friday and 112 on Saturday, forecasters said. Highs in Riverside will reach 97 on Friday, 99 on Saturday and 101 on Sunday.

Temperatures will begin to drop in the Coachella Valley on Sunday, but thunderstorms will be possible in the afternoon on Monday and Tuesday in the county deserts, forecasters said.

The county mountains could see thunderstorm activity each afternoon from Sunday through Wednesday.

High temperatures Thursday will be 95 degrees in Riverside, 107 in the Coachella Valley, 107 in the San Gorgonio Pass near Banning, 92 in Temecula and 98 in Hemet.

Nighttime lows could remain in the low 80s throughout the weekend in the Coachella Valley, 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 is expected to increase the threat of heat illness, and the NWS urged residents to drink plenty of fluids, stay out of the sun and check up on relatives and neighbors.

Cooling centers are open daily across the county, providing residents who do not live in climate-controlled environments a free, cool space to relax until the evening hours.

A complete list of cooling centers is available at www.capriverside.org/Portals/0/PDF/Cool/2019_Cool_Center_Directory_7_10 _2019.pdf.

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