Threemile Reservoir Weather Forecast

    • 48
    • 75

    Mostly Sunny

    • 54
    • 83

    Mostly Sunny

    • 51
    • 84

    Partly Sunny

    • 48
    • 77

    Partly Sunny

    • 40
    • 67

    Partly Sunny

    • 41
    • 63

    Mostly Sunny

Today 8 Sep Harney County

Sunny, warmer with Highs 66 to 75. Light Winds.

Tonight 8 Sep Harney County

Mostly clear. Lows 39 to 49. Northeast Winds up to 10 Mph.

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  • Temperature Real-Time

Threemile Reservoir Temperature Statistics

September Temperature

Rome (53.4 miles)

  • Lowest 5 September, 2026

    39.7 °F

  • Average September

    59.3 °F

  • Highest 1 September, 2026

    85.6 °F

Climate (2021–2026)

Rome (53.4 miles)

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  • Average Low 2021–2026

    36.6 °F

  • Average 2021–2026

    51.4 °F

  • Average High 2021–2026

    66.1 °F
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