More triple-digit temperatures are in the forecast through Monday’s Labor Day holiday for the Riverside County valleys and mountains and the Inland Empire, the National Weather Service said.

High temperatures are expected to reach 101 degrees in those areas — with heat advisories in place through 8 p.m. Monday.

Temperatures at higher elevations are forecast to be milder but still unseasonably warm.

“Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun,” an NWS statement advised.

“Take extra precautions if you work or spend time outside. When possible, reschedule strenuous activities to early morning or evening.”

Triple-digit temperatures toasted much of Riverside County on Sunday — including 113 degrees in Palm Springs, 112 in Thermal, 111 in Indio and 105 in San Jacinto.

Meteorologists said a ridge of high pressure building over Central California will dominate the region, reducing relative humidity and creating bone-dry conditions.

“With the heat building in, combined with dry fuels and diurnal winds, a few hours of elevated fire weather conditions are possible for inland areas each afternoon this weekend and early next week,” the NWS stated.

The ridge will cede to lower pressure systems going into Tuesday, drawing moisture from the coasts and returning temperatures to more seasonable levels, forecasters said.

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