Fullerton Weather Forecast

    • 58
    • 84

    Becoming Sunny

    • 59
    • 84

    Partly Sunny

    • 60
    • 89

    Partly Sunny

    • 58
    • 87

    Partly Sunny

    • 59
    • 82

    Mostly Cloudy

    • 56
    • 74

    Mostly Cloudy

Today 26 Mar Orange County Inland

Partly cloudy with patchy fog this morning. Becoming mostly sunny. Highs 78 to 82 towards the coast to 84 farther inland. Light Winds becoming west 10 Mph this afternoon.

Tonight 26 Mar Orange County Inland

Mostly clear in the evening. Becoming partly cloudy overnight with patchy fog. Lows 55 to 58. Areas of Winds southwest to 10 Mph in the evening becoming light.

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Fullerton Temperature Statistics

March Temperature

Fullerton, Fullerton Municipal Airport (3.1 miles)

  • Lowest 3 March, 2026

    51.7 °F

  • Average March

    69.7 °F

  • Highest 17 March, 2026

    100.7 °F

Climate (2021–Present)

Fullerton, Fullerton Municipal Airport (3.1 miles)

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  • Average Low 2021–2026

    57 °F

  • Average 2021–2026

    66.3 °F

  • Average High 2021–2026

    76.7 °F
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