Fullerton Municipal Airport Weather Forecast

    • 53
    • 69

    Patchy Fog

    • 51
    • 70

    Patchy Fog

    • 51
    • 69

    Mostly Cloudy

    • 56
    • 67

    Rain Showers

    • 54
    • 65

    Rain Showers

    • 52
    • 65

    Rain Showers

Today 20 Dec Orange County Inland

Mostly cloudy with patchy fog in the morning. Becoming partly cloudy. Highs around 70. Light Winds.

Tonight 20 Dec Orange County Inland

Partly cloudy in the evening. Becoming mostly cloudy overnight with patchy fog. Lows around 51. Light Winds.

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Fullerton Municipal Airport Temperature Statistics

December Temperature

Fullerton, Fullerton Municipal Airport (0 miles)

  • Lowest 5 December, 2025

    45 °F

  • Average December

    61 °F

  • Highest 10 December, 2025

    84.9 °F

Climate (2020–Present)

Fullerton, Fullerton Municipal Airport (0 miles)

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  • Average Low 2020–2025

    56.8 °F

  • Average 2020–2025

    66.1 °F

  • Average High 2020–2025

    76.4 °F
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