Fullerton Municipal Airport Weather Forecast

    • 56
    • 66

    Rain Showers

    • 55
    • 65

    Rain Showers

    • 54
    • 65

    Rain Showers Likely

    • 51
    • 64

    Rain Showers Likely

    • 49
    • 63

    Chance Rain Showers

    • 49
    • 64

    Slight Chance Rain Showers

Today 31 Dec Orange County Inland

Partly cloudy with a chance of Showers in the Morning, then mostly cloudy with Showers likely in the afternoon. Highs 66 to 69. Areas of Winds east 10 Mph. Chance of measurable precipitation 70 percent.

Tonight 31 Dec Orange County Inland

Showers. Locally heavy rainfall possible overnight. Lows 54 to 57. Areas of Winds east 10 Mph.

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Fullerton Municipal Airport Temperature Statistics

December Temperature

Fullerton, Fullerton Municipal Airport (0 miles)

  • Lowest 28 December, 2025

    44.1 °F

  • Average December

    60 °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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