Pioneer Park Weather Forecast

    • 52
    • 74

    Partly Sunny

    • 54
    • 78

    Mostly Sunny

    • 54
    • 80

    Mostly Sunny

    • 53
    • 77

    Mostly Sunny

    • 54
    • 77

    Patchy Fog

    • 54
    • 76

    Mostly Cloudy

Today 14 Dec Orange County Inland

Patchy fog this morning. Partly cloudy. Local visibility one quarter mile or less at Times this morning. Highs 72 to 75. Light Winds.

Tonight 14 Dec Orange County Inland

Mostly clear in the evening. Becoming partly cloudy overnight with patchy fog. Local visibility one quarter mile or less at Times overnight. Lows around 52. Light Winds.

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Pioneer Park Temperature Statistics

December Temperature

Fullerton, Fullerton Municipal Airport (6.2 miles)

  • Lowest 5 December, 2025

    45 °F

  • Average December

    62.7 °F

  • Highest 10 December, 2025

    84.9 °F

Climate (2020–Present)

Fullerton, Fullerton Municipal Airport (6.2 miles)

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  • Average Low 2020–2025

    56.8 °F

  • Average 2020–2025

    66.1 °F

  • Average High 2020–2025

    76.5 °F
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