Temperatures will climb Friday to levels considerably above normal, forecasters said.
The unseasonable heat is the product of a ridge on interior high pressure combined with an offshore flow, said National Weather Service meteorologist Kristen Stewart.
The NWS forecast sunny skies Friday and highs of 66 on Mount Wilson; 68 in Palmdale; 69 in Lancaster; 72 in Avalon; 74 in Saugus; 77 at LAX; 78 in Long Beach; 79 in San Gabriel and Burbank; 80 in Woodland Hills and Pasadena; and 81 in Downtown L.A.
Stewart said areas where temperatures will be 80 degrees are normally in the upper 60s at this time of the year.
Saturday’s highs will be about the same as Friday but Sunday’s will revert to the 60s, according to an NWS forecast.
Sunny skies were also forecast in Orange County, along with highs of 59 on Santiago Peak; 70 on Ortega Highway at 2,600 feet; 71 in San Clemente; 73 in Laguna Beach; 75 at Fremont Canyon; 76 in Newport Beach; 78 at Trabuco Canyon; 79 in Yorba Linda; 80 in Mission Viejo and Fullerton; 81 in Anaheim; and 82 in Irvine. The pattern will then be about the same as in L.A. County — about the same Saturday and a sharp retreat on Sunday.