Fullerton Weather Forecast

    • 57
    • 83

    Partly Sunny

    • 56
    • 85

    Mostly Sunny

    • 56
    • 83

    Partly Sunny

    • 55
    • 77

    Partly Sunny

    • 56
    • 77

    Mostly Sunny

    • 56
    • 75

    Partly Sunny

    • 53
    • 70

    Partly Sunny

Today 3 Apr Los Angeles County San Gabriel Valley

Partly cloudy. Highs in the upper 70s to mid 80s. Northeast Winds around 15 Mph.

Tonight 3 Apr Los Angeles County San Gabriel Valley

Partly cloudy. Lows in the mid 50s.

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Fullerton Temperature Statistics

April Temperature

Fullerton, Fullerton Municipal Airport (6.2 miles)

  • Lowest 1 April, 2026

    60.1 °F

  • Average April

    65.1 °F

  • Highest 1 April, 2026

    73 °F

Climate (2021–Present)

Fullerton, Fullerton Municipal Airport (6.2 miles)

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  • Average Low 2021–2026

    57 °F

  • Average 2021–2026

    66.4 °F

  • Average High 2021–2026

    76.7 °F
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