South Whittier Weather Forecast

    • 55
    • 78

    Patchy Fog

    • 53
    • 70

    Patchy Fog

    • 52
    • 70

    Patchy Fog

    • 53
    • 69

    Mostly Cloudy

    • 57
    • 68

    Rain Showers

    • 56
    • 64

    Rain Showers

    • 53
    • 65

    Rain Showers

Today 19 Dec Los Angeles County San Gabriel Valley

Sunny. Highs in the mid 70s to around 80.

Tonight 19 Dec Los Angeles County San Gabriel Valley

Low Clouds and fog developing. Lows in the lower to mid 50s.

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South Whittier Temperature Statistics

December Temperature

Fullerton, Fullerton Municipal Airport (5 miles)

  • Lowest 5 December, 2025

    45 °F

  • Average December

    61 °F

  • Highest 10 December, 2025

    84.9 °F

Climate (2020–Present)

Fullerton, Fullerton Municipal Airport (5 miles)

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  • Average Low 2020–2025

    56.8 °F

  • Average 2020–2025

    66.1 °F

  • Average High 2020–2025

    76.4 °F
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