Threemile Reservoir Weather Forecast

    • 11
    • 22

    Mostly Cloudy

    • 9
    • 28

    Partly Sunny

    • 2
    • 21

    Mostly Sunny

    • 4
    • 20

    Mostly Sunny

    • 6
    • 20

    Partly Sunny

    • 12
    • 24

    Partly Sunny

Today 21 Jan Beaverhead/Lemhi Highlands

Partly sunny. Highs 21 to 28.

Tonight 21 Jan Beaverhead/Lemhi Highlands

Mostly cloudy. Lows 6 to 16.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Threemile Reservoir Temperature Statistics

January Temperature

Rexburg, Rexburg-Madison County Airport (40.4 miles)

  • Lowest 11 January, 2026

    14 °F

  • Average January

    29.2 °F

  • Highest 3 January, 2026

    41 °F

Climate (2021–Present)

Rexburg, Rexburg-Madison County Airport (40.4 miles)

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  • Average Low 2021–2026

    34 °F

  • Average 2021–2026

    46 °F

  • Average High 2021–2026

    58 °F
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