Pioneer Park Weather Forecast

    • 48
    • 72

    Mostly Sunny

    • 48
    • 70

    Mostly Sunny

    • 50
    • 70

    Mostly Sunny

    • 53
    • 75

    Mostly Sunny

    • 55
    • 78

    Mostly Sunny

    • 56
    • 80

    Mostly Sunny

Today 4 Dec Orange County Inland

Mostly sunny. Highs around 71. Areas of Winds northeast 15 to 25 Mph with Gusts to 40 Mph becoming west to 10 Mph in the afternoon.

Tonight 4 Dec Orange County Inland

Mostly clear. Lows 42 to 47. Areas of Winds east to 10 Mph.

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Pioneer Park Temperature Statistics

December Temperature

Fullerton, Fullerton Municipal Airport (6.2 miles)

  • Lowest 2 December, 2025

    48 °F

  • Average December

    58.2 °F

  • Highest 1 December, 2025

    72 °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 °F

  • Average High 2020–2025

    76.5 °F
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