September Heat-Up Forecast In Riverside County

RIVERSIDE COUNTY, CA — Triple-digit heat is returning to the forecast for the Riverside metropolitan area to start September, according to the National Weather Service.

The agency said that beginning Tuesday and continuing to the end of next week, temperatures "five to 10 degrees above average" will be prevalent across the Inland Empire.

NWS surface prognostication charts indicated that ridges of high pressure moving through the Great Basin of Nevada and Utah will influence weather patterns after Labor Day.

No heat advisories have been issued.

In the Riverside metropolitan area, daytime temperatures for the remainder of this week will top out in the low- to mid-90s, but the mercury is forecast to cross the 100-degree mark next Tuesday, Wednesday and Thursday, with overnight lows generally in the mid 60s.

In the Coachella Valley, the temperature swings won't be as pronounced. Daytime highs for the rest of the current week will continue to edge toward 110, with lows in the mid-80s.

After Labor Day, the mercury is predicted to range into the 110s daily to the end of next week. There's also a chance for scattered monsoonal thunderstorms in the Coachella and Palo Verde valleys next week, according to the National Weather Service.

The Temecula Valley will continue with seasonable daytime highs around 90 degrees for the rest of August, and after Labor Day, the end-of-summer temperature spike will put the mercury just below 100 for a few days, with lows in the mid 60s.