Threemile Reservoir Weather Forecast

    • 46
    • 76

    Mostly Sunny

    • 48
    • 75

    Mostly Sunny

    • 46
    • 71

    Chance Rain Showers

    • 47
    • 74

    Mostly Sunny

    • 49
    • 77

    Mostly Sunny

    • 51
    • 81

    Partly Sunny

Today 15 Sep Harney County

Mostly sunny. Highs 67 to 75. Light Winds.

Tonight 15 Sep Harney County

Increasing Clouds. Lows 40 to 47. North Winds 10 to 15 Mph. Gusts to 30 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Threemile Reservoir Temperature Statistics

September Temperature

Rome (53.4 miles)

  • Lowest 7 September, 2026

    35.7 °F

  • Average September

    60.9 °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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