Hillcrest Park Weather Forecast

    • 51
    • 73

    Mostly Sunny

    • 52
    • 76

    Patchy Fog

    • 54
    • 74

    Partly Sunny

    • 55
    • 80

    Partly Sunny

    • 53
    • 78

    Patchy Fog

    • 53
    • 73

    Patchy Fog

    • 54
    • 72

    Mostly Cloudy

Today 15 Dec Orange County Inland

Partly cloudy with patchy fog this morning. Becoming sunny. Local visibility one quarter mile or less at Times this morning. Warmer. Highs around 71 towards the coast to 73 to 77 farther inland. Light Winds.

Tonight 15 Dec Orange County Inland

Partly cloudy. Patchy fog overnight. Lows 49 to 53. Light Winds.

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Hillcrest Park Temperature Statistics

December Temperature

Fullerton, Fullerton Municipal Airport (3.7 miles)

  • Lowest 5 December, 2025

    45 °F

  • Average December

    62.2 °F

  • Highest 10 December, 2025

    84.9 °F

Climate (2020–Present)

Fullerton, Fullerton Municipal Airport (3.7 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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