Southern California residents should prepare for a significant warm-up next week as temperatures are expected to climb toward triple digits in some areas, according to KTLA forecaster Kirk Hawkins.

An extreme heat watch has been issued for portions of inland Southern California from Tuesday through Thursday night as a strengthening ridge of high pressure builds over the region, Hawkins said.

The hottest conditions are expected in inland valleys, mountains and desert communities, where temperatures could approach or exceed 100 degrees. In the High Desert, highs are forecast to reach about 98 degrees Tuesday and Wednesday.

“The ridge of high pressure is expected to build in early next week and really warm things up during the latter part of the week,” Hawkins said.

According to the National Weather Service, an extreme heat watch is issued when dangerously hot conditions are possible, allowing residents time to prepare for prolonged periods of excessive heat.

Air quality could also become a concern in some inland communities. Hawkins said moderate air quality conditions were reported Saturday in areas including Hesperia, Rancho Cucamonga and Big Bear, while coastal communities continued to see cleaner air and cooler temperatures.

Along with the heat, forecasters are expecting afternoon gusty winds in some mountain and desert locations.

Meanwhile, beachgoers looking to escape the heat may find cooler temperatures along the coast, though Hawkins warned of hazardous beach conditions. Elevated surf and dangerous rip currents are expected to continue through the weekend.

Saturday’s weather remained relatively mild across much of Southern California, with sunshine, a few clouds and calm winds. Coastal temperatures are expected to remain below normal even as inland communities heat up next week.

Residents are encouraged to stay hydrated, limit strenuous outdoor activities during the hottest parts of the day and check on vulnerable family members, neighbors and pets as temperatures rise.

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