Temperatures will rise slightly Thursday but remain below average for this time of the year before a significant warming trend gets underway Friday, forecasters said.

“The cold air is finally on its way out,” said National Weather Service meteorologist Andrew Rorke, describing Thursday as a “transitional day” and adding that the warmer weather will result from an approaching high-pressure system.

Friday’s warmup will see temperatures rise 12 degrees and 13 degrees in several L.A. County communities, including Downtown L.A., where Friday’s high is forecast to be 82 degrees, and Woodland Hills, where the high will be 92. On the whole, L.A. County temperatures will be 5-10 degrees above normal, Rorke said.

The NWS forecast partly cloudy skies in L.A. County Thursday and highs of 66 degrees in Avalon and at LAX; 69 on Mount Wilson; 70 in downtown L.A.; 71 in Long Beach; 74 in San Gabriel; 75 in Pasadena and Burbank; 77 in Saugus; 79 in Woodland Hills; and 80 in Palmdale and Lancaster. Temperatures will be more than 10 degrees higher amid sunshine Friday and remain at those levels — even amid cloudy skies — through at least Wednesday.

Sunny skies were forecast in Orange County Thursday, along with highs of 64 in Newport Beach and San Clemente; 65 in Laguna Beach; 72 in Irvine and Mission Viejo; 73 in Anaheim; and 74 in Fullerton and Yoba Linda. Friday’s temperatures will be higher, including a whopping 18 degrees higher in Mission Viejo.

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