Fullerton Weather Forecast

    • 51
    • 58

    Rain Showers

    • 48
    • 60

    Rain

    • 41
    • 55

    Rain Showers

    • 45
    • 54

    Chance Rain Showers

    • 47
    • 63

    Partly Sunny

    • 49
    • 68

    Mostly Cloudy

    • 46
    • 64

    Chance Rain

Today 11 Mar Los Angeles County San Gabriel Valley

Rain. Highs in the mid 50s to around 60.

Tonight 11 Mar Los Angeles County San Gabriel Valley

Mostly cloudy. A 40 percent chance of Showers in the evening. Lows around 50.

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Fullerton Temperature Statistics

March Temperature

Fullerton, Fullerton Municipal Airport (6.2 miles)

  • Lowest 8 March, 2025

    44.1 °F

  • Average March

    57.1 °F

  • Highest 9 March, 2025

    72 °F

Climate (2020–Present)

Fullerton, Fullerton Municipal Airport (6.2 miles)

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  • Average Low 2020–2025

    56.9 °F

  • Average 2020–2025

    66.1 °F

  • Average High 2020–2025

    76.8 °F
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