Fullerton Municipal Airport Weather Forecast

    • 45
    • 73

    Becoming Sunny

    • 46
    • 73

    Mostly Sunny

    • 48
    • 72

    Mostly Cloudy

    • 50
    • 75

    Mostly Sunny

    • 51
    • 77

    Partly Sunny

    • 52
    • 77

    Mostly Cloudy

Today 26 Jan Orange County Inland

Partly cloudy in the morning. Becoming mostly sunny. Highs 70 to 73. Areas of Winds east to 10 Mph in the morning becoming light.

Tonight 26 Jan Orange County Inland

Clear. Lows 45 to 48. Areas of Winds east to 10 Mph.

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Fullerton Municipal Airport Temperature Statistics

January Temperature

Fullerton, Fullerton Municipal Airport (0 miles)

  • Lowest 10 January, 2026

    39.7 °F

  • Average January

    61.4 °F

  • Highest 14 January, 2026

    85.6 °F

Climate (2021–Present)

Fullerton, Fullerton Municipal Airport (0 miles)

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  • Average Low 2021–2026

    56.9 °F

  • Average 2021–2026

    66.1 °F

  • Average High 2021–2026

    76.4 °F
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