Olive Hills Reservoir Weather Forecast

    • 51
    • 76

    Mostly Sunny

    • 54
    • 70

    Mostly Cloudy

    • 53
    • 66

    Mostly Cloudy

    • 51
    • 66

    Partly Sunny

    • 50
    • 70

    Mostly Sunny

    • 51
    • 72

    Partly Sunny

Today 20 Jan Orange County Inland

Partly cloudy in the morning. Becoming mostly sunny. Highs around 74 towards the coast to 75 to 78 farther inland. Areas of Winds east to 10 Mph in the morning becoming light.

Tonight 20 Jan Orange County Inland

Mostly clear in the evening. Becoming partly cloudy overnight with patchy fog. Lows 49 to 52. Light Winds.

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  • 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

    62.5 °F

  • Highest 14 January, 2026

    84.9 °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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