Olive Hills Reservoir Weather Forecast

    • 56
    • 79

    Mostly Sunny

    • 54
    • 78

    Partly Sunny

    • 54
    • 77

    Partly Sunny

    • 54
    • 75

    Partly Sunny

    • 51
    • 73

    Mostly Sunny

    • 51
    • 71

    Partly Sunny

Today 16 Jan Orange County Inland

Mostly sunny. Highs around 80. Light Winds.

Tonight 16 Jan Orange County Inland

Mostly clear in the evening. Becoming partly cloudy. Lows 52 to 56. Areas of Winds northeast to 10 Mph. Gusts to 25 Mph overnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Olive Hills Reservoir Temperature Statistics

January Temperature

Fullerton, Fullerton Municipal Airport (9.3 miles)

  • Lowest 9 January, 2026

    42.1 °F

  • Average January

    60.5 °F

  • Highest 13 January, 2026

    80.1 °F

Climate (2021–Present)

Fullerton, Fullerton Municipal Airport (9.3 miles)

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  • Average Low 2021–2026

    56.9 °F

  • Average 2021–2026

    66.1 °F

  • Average High 2021–2026

    76.4 °F
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