Olive Hills Reservoir Weather Forecast

    • 52
    • 73

    Decreasing Clouds

    • 55
    • 76

    Mostly Sunny

    • 54
    • 78

    Mostly Sunny

    • 55
    • 75

    Partly Sunny

    • 55
    • 77

    Patchy Fog

    • 53
    • 75

    Patchy Fog

    • 53
    • 70

    Partly Sunny

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 this evening. Becoming partly cloudy. Patchy fog overnight. Local visibility one quarter mile or less at Times overnight. Lows 50 to 53. Light Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Olive Hills Reservoir Temperature Statistics

December Temperature

Fullerton, Fullerton Municipal Airport (9.3 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 (9.3 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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