Threemile Reservoir Weather Forecast

    • 37
    • 58

    Mostly Sunny

    • 33
    • 61

    Partly Sunny

    • 34
    • 60

    Mostly Cloudy

    • 41
    • 63

    Mostly Cloudy

    • 43
    • 69

    Partly Sunny

    • 42
    • 65

    Partly Sunny

Today 28 Oct Harney County

Sunny. Not as cool with Highs 51 to 57. East Winds 10 to 15 Mph.

Tonight 28 Oct Harney County

Partly cloudy. Lows 23 to 35. East Winds 10 to 15 Mph.

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Threemile Reservoir Temperature Statistics

October Temperature

Rome (53.4 miles)

  • Lowest 21 October, 2025

    21.9 °F

  • Average October

    49.7 °F

  • Highest 9 October, 2025

    79 °F

Climate (2020–Present)

Rome (53.4 miles)

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  • Average Low 2020–2025

    36.5 °F

  • Average 2020–2025

    51.3 °F

  • Average High 2020–2025

    65.7 °F
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