Fullerton Weather Forecast

    • 63
    • 82

    Gradual Clearing

    • 63
    • 85

    Partly Sunny

    • 63
    • 85

    Partly Sunny

    • 64
    • 87

    Partly Sunny

    • 65
    • 88

    Mostly Sunny

    • 65
    • 89

    Mostly Sunny

Today 14 Aug Los Angeles County San Gabriel Valley

Cloudy in the morning then partly cloudy. Highs in the 80s.

Tonight 14 Aug Los Angeles County San Gabriel Valley

Mostly clear in the evening then partly cloudy. Lows in the upper 50s to mid 60s.

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Fullerton Temperature Statistics

August Temperature

Fullerton, Fullerton Municipal Airport (6.2 miles)

  • Lowest 5 August, 2026

    67.6 °F

  • Average August

    80.2 °F

  • Highest 8 August, 2026

    97.6 °F

Climate (2021–2026)

Fullerton, Fullerton Municipal Airport (6.2 miles)

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  • Average Low 2021–2026

    57.1 °F

  • Average 2021–2026

    66.5 °F

  • Average High 2021–2026

    76.8 °F
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