Threemile Reservoir Weather Forecast

    • 47
    • 69

    Rain

    • 44
    • 65

    Rain Showers

    • 42
    • 62

    Rain Showers Likely

    • 42
    • 67

    Mostly Sunny

    • 44
    • 70

    Mostly Sunny

    • 44
    • 70

    Mostly Sunny

Today 17 Sep Beaverhead/Lemhi Highlands

Mostly cloudy. A chance of rain Showers and a slight chance of Thunderstorms in the morning. Then a chance of Showers and Thunderstorms in the afternoon. Highs 66 to 75.

Tonight 17 Sep Beaverhead/Lemhi Highlands

A chance of Showers and Thunderstorms in the evening. Then rain Showers likely and a slight chance of Thunderstorms after midnight. Lows 41 to 51.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Threemile Reservoir Temperature Statistics

September Temperature

Rexburg, Rexburg-Madison County Airport (40.4 miles)

  • Lowest 8 September, 2026

    36.6 °F

  • Average September

    62.4 °F

  • Highest 6 September, 2026

    84.7 °F

Climate (2021–2026)

Rexburg, Rexburg-Madison County Airport (40.4 miles)

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  • Average Low 2021–2026

    34.4 °F

  • Average 2021–2026

    46.5 °F

  • Average High 2021–2026

    58.6 °F
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