Olive Hills Reservoir Weather Forecast

    • 49
    • 67

    Becoming Sunny

    • 48
    • 70

    Mostly Sunny

    • 48
    • 68

    Mostly Sunny

    • 50
    • 68

    Mostly Sunny

    • 53
    • 73

    Mostly Sunny

    • 55
    • 76

    Mostly Sunny

    • 55
    • 78

    Mostly Sunny

Today 3 Dec Orange County Inland

Partly cloudy this morning. Becoming mostly sunny. Highs 66 to 71. Areas of Winds east to 10 Mph with Gusts to 25 Mph becoming southwest with Gusts to 30 Mph this afternoon.

Tonight 3 Dec Orange County Inland

Partly cloudy this evening. Becoming mostly clear. Lows 42 to 49. Areas of Winds northeast 15 to 25 Mph. Gusts to 30 Mph. Becoming 45 Mph overnight.

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  • Temperature Real-Time

Olive Hills Reservoir Temperature Statistics

December Temperature

Fullerton, Fullerton Municipal Airport (9.3 miles)

  • Lowest 1 December, 2025

    51.1 °F

  • Average December

    59.3 °F

  • Highest 1 December, 2025

    72 °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

    76.5 °F
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