The Inland Empire roasted again Friday as the late-summer heat wave held its grip on the region, sending the mercury beyond the century mark — or close to it — almost everywhere in Riverside County.

In the mountaintop community of Idyllwild, the temperature peaked at 96 degrees, tying a record high set on Sept. 2, 1950. A new record high was recorded on Aug. 31, also 96 degrees, breaking the high of 94 recorded in 2017.

Other locations were broiling, with the Riverside metropolitan area reaching 103, Palm Springs topping out at 108, and Temecula peaking at 99, according to the National Weather Service.

An Excessive Heat Warning remains in effect until 8 p.m. Tuesday.

“Extreme heat will significantly increase the potential for heat-related illnesses, particularly for those working or participating in outdoor activities,” the Weather Service said.

The California Independent System Operator, which manages the power grid, called another Flex Alert Friday, lasting until 9 p.m., and Cal-ISO said a Flex Alert would be in effect Saturday, asking residents to minimize power consumption whenever possible due to elevated demand as air-conditioning units run flat-out.

“With excessive heat in the forecast across much of the state and Western U.S., the grid operator is expecting high electricity demand … and is calling for voluntary conservation steps to help balance supply and demand,” according to Cal-ISO.

The extreme heat and low humidity are ratcheting up wildfire dangers. On Wednesday, a major brush fire broke out in Castaic, consuming more than 5,200 acres, injuring several firefighters and forcing evacuations and road closures.

So far, only small-scale brushers have erupted in Riverside County, causing little damage.

“High pressure will persist over the area creating a prolonged period of very hot conditions with minimal coastal clouds,” the NWS said.

“Triple-digit heat is expected for many valley and mountain locations through early next week, including coastal areas during the Sunday and Labor Day peak,” the agency said. “This heat may be record-breaking and will produce a very high risk of heat illness.”

Residents were urged to take power-saving steps such as:

— setting thermostats to 78 degrees or higher;

— avoiding use of major appliances;

— turning off unnecessary lights; and

— avoid charging electric vehicles.

Residents were also advised to pre-cool their homes as much as possible, and close blinds and drapes to keep interiors cool.

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