Fullerton Weather Forecast

    • 57
    • 79

    Mostly Sunny

    • 58
    • 80

    Mostly Sunny

    • 57
    • 80

    Partly Sunny

    • 55
    • 78

    Patchy Fog

    • 55
    • 77

    Partly Sunny

    • 54
    • 74

    Partly Sunny

    • 56
    • 73

    Mostly Sunny

Today 31 Oct Los Angeles County San Gabriel Valley

Low Clouds and fog in the morning then sunny. Highs around 80.

Tonight 31 Oct Los Angeles County San Gabriel Valley

Clear in the evening then low Clouds and fog. Lows in the mid 50s to around 60.

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Fullerton Temperature Statistics

October Temperature

Fullerton, Fullerton Municipal Airport (6.2 miles)

  • Lowest 16 October, 2025

    51.1 °F

  • Average October

    67.3 °F

  • Highest 29 October, 2025

    93.9 °F

Climate (2020–Present)

Fullerton, Fullerton Municipal Airport (6.2 miles)

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  • Average Low 2020–2025

    56.7 °F

  • Average 2020–2025

    66 °F

  • Average High 2020–2025

    76.5 °F
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