Threemile Reservoir Weather Forecast

    • 45
    • 72

    Becoming Sunny

    • 50
    • 80

    Mostly Sunny

    • 53
    • 84

    Mostly Sunny

    • 56
    • 84

    Mostly Cloudy

    • 56
    • 85

    Mostly Cloudy

    • 53
    • 81

    Slight Chance Rain Showers

Today 15 Sep Harney County

Areas of fog this morning. Sunny. Highs 63 to 73. Light Winds.

Tonight 15 Sep Harney County

Mostly clear. Lows 35 to 44. Light Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Threemile Reservoir Temperature Statistics

September Temperature

Rome (53.4 miles)

  • Lowest 12 September, 2025

    42.1 °F

  • Average September

    69.8 °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

    51.4 °F

  • Average High 2020–2025

    65.8 °F
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