Fullerton Weather Forecast

    • 58
    • 84

    Increasing Clouds

    • 60
    • 88

    Partly Sunny

    • 60
    • 88

    Mostly Sunny

    • 59
    • 79

    Mostly Cloudy

    • 56
    • 70

    Chance Rain

    • 55
    • 70

    Mostly Cloudy

Today 27 Mar Los Angeles County San Gabriel Valley

Areas of low Clouds and fog in the morning then sunny. Fog locally dense with visibility one quarter mile or less. Highs in the mid 80s to around 90.

Tonight 27 Mar Los Angeles County San Gabriel Valley

Mostly clear in the evening then Areas of low Clouds and fog. Lows in the mid 50s to around 60.

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Fullerton Temperature Statistics

March Temperature

Fullerton, Fullerton Municipal Airport (6.2 miles)

  • Lowest 6 March, 2026

    50.6 °F

  • Average March

    69.5 °F

  • Highest 17 March, 2026

    100.7 °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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