Boysen Park Weather Forecast

    • 51
    • 70

    Mostly Cloudy

    • 54
    • 70

    Mostly Cloudy

    • 57
    • 67

    Rain Showers

    • 56
    • 64

    Rain Showers

    • 53
    • 65

    Rain Showers

    • 48
    • 63

    Rain Showers

    • 47
    • 64

    Chance Rain Showers

Today 21 Dec Orange County Inland

Mostly cloudy this morning. Becoming partly cloudy. Patchy fog this morning. Highs 69 to 72. Light Winds.

Tonight 21 Dec Orange County Inland

Partly cloudy this evening. Becoming mostly cloudy. Patchy fog overnight. Lows 48 to 52. 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

    60.9 °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

    76.4 °F
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