Fullerton Weather Forecast

    • 60
    • 93

    Sunny

    • 56
    • 88

    Mostly Sunny

    • 57
    • 85

    Mostly Sunny

    • 57
    • 89

    Sunny

    • 62
    • 90

    Sunny

    • 60
    • 90

    Mostly Sunny

Today 20 Mar Los Angeles County San Gabriel Valley

Sunny. Highs 92 to 100.

Tonight 20 Mar Los Angeles County San Gabriel Valley

Clear. Lows in the upper 50s and 60s.

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Fullerton Temperature Statistics

March Temperature

Fullerton, Fullerton Municipal Airport (6.2 miles)

  • Lowest 3 March, 2026

    51.7 °F

  • Average March

    68.3 °F

  • Highest 12 March, 2026

    94.6 °F

Climate (2021–Present)

Fullerton, Fullerton Municipal Airport (6.2 miles)

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  • Average Low 2021–2026

    56.9 °F

  • Average 2021–2026

    66.3 °F

  • Average High 2021–2026

    76.7 °F
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