Threemile Reservoir Weather Forecast

    • 58
    • 85

    Increasing Clouds

    • 56
    • 81

    Mostly Cloudy

    • 52
    • 79

    Partly Sunny

    • 46
    • 76

    Mostly Sunny

    • 51
    • 79

    Mostly Sunny

    • 52
    • 83

    Slight Chance Rain Showers

Today 18 Sep Harney County

Mostly sunny. Highs 76 to 86. East Winds up to 10 Mph.

Tonight 18 Sep Harney County

Mostly cloudy. Lows 47 to 58. Northeast Winds up to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Threemile Reservoir Temperature Statistics

September Temperature

Rome (53.4 miles)

  • Lowest 16 September, 2025

    37 °F

  • Average September

    67.7 °F

  • Highest 2 September, 2025

    96.1 °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

    65.8 °F
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