Threemile Reservoir Weather Forecast

    • 47
    • 79

    Mostly Sunny

    • 52
    • 82

    Partly Sunny

    • 53
    • 87

    Partly Sunny

    • 39
    • 72

    Partly Sunny

    • 43
    • 66

    Partly Sunny

    • 40
    • 67

    Partly Sunny

Today 22 Sep Harney County

Mostly sunny. Highs 64 to 70.

Tonight 22 Sep Harney County

Decreasing Clouds. Lows 38 to 48. Northwest Winds 10 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Threemile Reservoir Temperature Statistics

September Temperature

Rome (53.4 miles)

  • Lowest 15 September, 2026

    33.7 °F

  • Average September

    59.9 °F

  • Highest 9 September, 2026

    88.6 °F

Climate (2021–2026)

Rome (53.4 miles)

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  • Average Low 2021–2026

    36.5 °F

  • Average 2021–2026

    51.4 °F

  • Average High 2021–2026

    66.1 °F
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