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LOS ANGELES (FOX 11 / CNS) - New wrinkles will appear in the Southland's sweltering weather Tuesday in the form of muggy conditions and precipitation.

The National Weather Service said there's a 20 percent chance of showers or thunderstorms this afternoon in the San Gabriel and Antelope valleys, and a slight chance of the same in the San Gabriel Mountains some time today.

The NWS forecast mostly cloudy skies in L.A. County today and highs of 83 degrees in Avalon; 85 at LAX; 86 in Long Beach and on Mount Wilson; 91 in Burbank; 92 in Downtown Los Angeles; 93 in San Gabriel; 95 in Pasadena; 96 in Saugus; 97 in Woodland Hills; 98 in Lancaster; and 99 in Palmdale.

Partly cloudy skies were forecast in Orange Country, along with highs of 82 in San Clemente; 85 in Newport Beach and Laguna Beach; 91 in Anaheim; 92 in Fullerton and Irvine; 93 in Mission Viejo; and 95 in Yorba Linda.

Today's temperatures will be about the same as Monday's and slightly lower Wednesday.