Heatwave Descends On Southwest RivCo, Where To Keep Cool Amid Rising Temperatures

SOUTHWEST RIVERSIDE COUNTY, CA — Baking hot temperatures are forecast to grip Temecula, Murrieta, Lake Elsinore, Wildomar and the Inland Empire for the remainder of the week through the end of July.

That intensifying heat prompted the National Weather Service on Wednesday to revise heat warnings and remind residents to take precautions while outdoors.

The agency said that triple-digit daytime heat will be the norm throughout the region for at least the next several days.

Heat Advisories previously issued for the Riverside metropolitan area and the Anza and San Jacinto valleys were changed to an Extreme Heat Warning, which will remain in effect until 8 p.m. Monday.

The prior Extreme Heat Warning posted for the Coachella Valley has not changed and is also in effect until Monday evening.

"High temperatures on Thursday and Friday will be around 10 degrees above average for inland areas, with highs ranging from the upper 90s to 110 for the Inland Empire, with 112 to 118 for the lower deserts," the NWS said in a statement. "Heat-related illnesses increase significantly during extreme heat events. Drink plenty of fluids, stay in air-conditioned rooms and stay out of the sun."

Ridges of high pressure settling to the north and east will influence weather patterns into early next week, ratcheting up dry conditions. However, fetches of moisture may also drag into the region due to monsoonal activity in Baja Mexico, generating instability and isolated thunderstorms in and around mountainous areas of the San Gorgonio Pass and lower Coachella Valley, according to prognostication charts.

Will There Be Monsoons?

The only strong chance for precipitation is Friday, forecasters said. The Weather Service said the high heat will more than probably return next week. The National Oceanic & Atmospheric Administration recently declared that an El Niño has developed in the Pacific, and it's intensifying, raising sea temperatures well above average. It has been attributed to the birth of Hurricane Fausto, currently tracking toward Hawaii as a Category 2 cyclone.

For Palm Springs, Indio, Rancho Mirage and adjacent spots, daytime highs will climb to at or above 115 for the remainder of the week. Lows will be in the low 90s until Sunday, the NWS said.

In the Riverside metropolitan area, temps will be in the low 100s until next Monday. Lows will generally settle in the low to mid 70s now through the weekend.

In the Temecula Valley, highs will rise into the upper 90s over the next few days, with a heat index due to increased humidity making it feel like the low 100s, according to the NWS. Lows will fall into the upper 60s each night, forecasters said.

Need to stay cool in Temecula? Here are some cooling center options for you.

Mary Phillips Senior Center

• Address: 41845 Sixth St., Temecula
• Hours: 9 a.m. to 4 p.m. Monday through Friday
• Phone: 951-694-6464

The Mary Phillips Senior Center appears in the county’s 2026 Cool Center directory. Unlike some other senior facilities in the directory, the Temecula center is not specifically marked “seniors only.” Residents should call ahead to confirm admission requirements and available services.

Public alternative: Ronald H. Roberts Temecula Public Library

• Address: 30600 Pauba Road
• Hours: 10 a.m. to 8 p.m. Monday through Thursday; 10 a.m. to 6 p.m. Friday; 10 a.m. to 5 p.m. Saturday; and 1 to 5 p.m. Sunday
• Phone: 951-693-8900

The library is open to all ages and offers air conditioning, seating, restrooms, Wi-Fi and access to books and computers. Library information and current hours are available here.

Other option: Promenade Temecula, 40820 Winchester Road, is open from 10 a.m. to 8 p.m. Monday through Thursday, 10 a.m. to 9 p.m. Friday and Saturday, and 11 a.m. to 6 p.m. Sunday. The mall is not a designated Cool Center but can provide air-conditioned relief during business hours. Check mall hours here.

What To Expect At A Cool Center

Cool Centers are generally drop-in locations where people can spend time in an air-conditioned setting during dangerous heat. Seating, water, snacks, activities, charging outlets and pet accommodations vary by site.

Visitors may want to bring:

• Water and a refillable bottle
• Necessary medications
• A phone charger
• Quiet activities or reading material
• Identification and emergency contact information
• Supplies for children or service animals

Call before bringing a pet as only some centers may accept animals.

Heat exhaustion symptoms can include heavy sweating, headache, nausea, dizziness, weakness, thirst and an elevated body temperature, according to the Centers for Disease Control and Prevention. Confusion, loss of coordination, seizures, unconsciousness or a very high body temperature may indicate heat stroke, which is a medical emergency. Call 911 and begin cooling the person immediately.