This weekend and early next week will be anything but autumn-like, with triple-digit temperatures returning to the Inland Empire amid a general drying out of the western United States.
The National Weather Service posted an Excessive Heat Warning for the Coachella Valley, San Gorgonio Pass and parts farther east, beginning 11 a.m. Sunday and continuing until 11 p.m. Tuesday. An Excessive Heat Watch is in effect Monday to Wednesday for the Riverside metropolitan area and surrounding locations, including the Perris and San Jacinto valleys.
“High pressure will become the dominant driver of our weather over the region into early next week,” the NWS said in a statement. “Temperatures will continue to increase through the weekend, peaking Monday and Tuesday. Inland temperatures … should rise 8-15 degrees above normal, and up to 10 degrees above normal in the deserts. That means temperatures 100 to 105 for the Inland Empire.”
Forecasters said that high-pressure systems stacked over the Great Basin in Utah and Nevada, as well as another moving in from the Pacific, will influence weather patterns in the southwest U.S., jettisoning moisture and cranking up the furnace.
In Riverside metro, the mercury will head into the upper 90s by Sunday and triple digits Monday and Tuesday, according to meteorologists. Lows will hover in the upper 60s over the next five days.
In the Coachella Valley, triple-digit heat began Friday, and by Monday, highs will approach 110, the NWS said.
Nightly lows will be in the upper 70s and low 80s.
In the Temecula Valley, daytime highs will top out in the mid to upper 90s Sunday to Tuesday, and lows will be around 70, forecasters said.
The region baked for more than a week in the previous heat wave, which began at the end of August and continued through Labor Day weekend, with highs in Riverside metro settling in the low 100s each day.