Olive Hills Reservoir Weather Forecast

    • 54
    • 78

    Mostly Sunny

    • 52
    • 76

    Mostly Sunny

    • 53
    • 75

    Partly Sunny

    • 52
    • 74

    Mostly Sunny

    • 52
    • 74

    Mostly Sunny

    • 53
    • 74

    Partly Sunny

Today 11 Dec Orange County Inland

Mostly sunny. Highs around 76 towards the coast to 80 farther inland. Areas of Winds northeast to 10 Mph in the morning becoming light.

Tonight 11 Dec Orange County Inland

Mostly clear in the evening. Becoming partly cloudy. Lows 52 to 55. Light Winds.

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Olive Hills Reservoir Temperature Statistics

December Temperature

Fullerton, Fullerton Municipal Airport (9.3 miles)

  • Lowest 5 December, 2025

    45 °F

  • Average December

    60 °F

  • Highest 8 December, 2025

    81 °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 °F

  • Average High 2020–2025

    76.4 °F
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