Fullerton Weather Forecast

    • 52
    • 73

    Increasing Clouds

    • 50
    • 68

    Rain Showers Likely

    • 51
    • 68

    Partly Sunny

    • 51
    • 68

    Partly Sunny

    • 54
    • 73

    Partly Sunny

    • 53
    • 72

    Partly Sunny

    • 54
    • 74

    Mostly Sunny

Today 24 Apr Los Angeles County San Gabriel Valley

Partly cloudy in the morning then sunny. Highs in the lower to mid 70s.

Tonight 24 Apr Los Angeles County San Gabriel Valley

Mostly cloudy. Lows in the upper 40s to mid 50s.

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Fullerton Temperature Statistics

April Temperature

Fullerton, Fullerton Municipal Airport (6.2 miles)

  • Lowest 4 April, 2026

    52.6 °F

  • Average April

    67.3 °F

  • Highest 4 April, 2026

    91.7 °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

    76.8 °F
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