Boysen Park Weather Forecast

    • 49
    • 75

    Mostly Sunny

    • 54
    • 80

    Mostly Sunny

    • 55
    • 83

    Sunny

    • 51
    • 79

    Mostly Sunny

    • 53
    • 80

    Mostly Sunny

    • 54
    • 80

    Mostly Sunny

    • 53
    • 76

    Mostly Sunny

Today 7 Dec Orange County Inland

Mostly sunny. Highs around 72 towards the coast to 73 to 76 farther inland. Light Winds.

Tonight 7 Dec Orange County Inland

Mostly clear in the evening. Becoming partly cloudy. Patchy dense fog. Local visibility one quarter mile or less at Times. Lows around 51. Light Winds.

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Boysen Park Temperature Statistics

December Temperature

Fullerton, Fullerton Municipal Airport (6.2 miles)

  • Lowest 5 December, 2025

    45 °F

  • Average December

    59.1 °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

    76.4 °F
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