Olive Hills Reservoir Weather Forecast

    • 56
    • 63

    Rain Showers

    • 48
    • 59

    Rain Showers

    • 46
    • 60

    Mostly Sunny

    • 48
    • 65

    Mostly Sunny

    • 51
    • 67

    Partly Sunny

    • 53
    • 71

    Mostly Cloudy

Today 25 Dec Orange County Inland

Mostly cloudy with a chance of Showers. A slight chance of Thunderstorms in the afternoon. Highs 63 to 66. Areas of Winds south 10 to 15 Mph with Gusts to 30 Mph. Chance of measurable precipitation 50 percent.

Tonight 25 Dec Orange County Inland

Cloudy. A chance of Showers in the Evening, then Showers overnight. Lows 52 to 58. Areas of Winds south 10 to 15 Mph with Gusts to 25 Mph.

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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

    60.5 °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

    76.4 °F
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