Fullerton Weather Forecast

    • 55
    • 73

    Sunny

    • 57
    • 79

    Sunny

    • 64
    • 86

    Sunny

    • 67
    • 90

    Sunny

    • 67
    • 90

    Sunny

    • 65
    • 88

    Sunny

Today 13 Oct Los Angeles County San Gabriel Valley

Sunny. Highs in the upper 60s to mid 70s.

Tonight 13 Oct Los Angeles County San Gabriel Valley

Clear. Lows in the lower to mid 50s.

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Fullerton Temperature Statistics

October Temperature

Fullerton, Fullerton Municipal Airport (6.2 miles)

  • Lowest 2 October, 2026

    65.6 °F

  • Average October

    83.1 °F

  • Highest 3 October, 2026

    105.7 °F

Climate (2021–2026)

Fullerton, Fullerton Municipal Airport (6.2 miles)

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  • Average Low 2021–2026

    57.2 °F

  • Average 2021–2026

    66.8 °F

  • Average High 2021–2026

    77 °F
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