Threemile Reservoir Weather Forecast

    • 48
    • 74

    Mostly Sunny

    • 53
    • 79

    Mostly Sunny

    • 54
    • 84

    Slight Chance Thunderstorms

    • 54
    • 86

    Partly Sunny

    • 50
    • 78

    Partly Sunny

    • 51
    • 78

    Mostly Sunny

Today 6 Jul Beaverhead/Lemhi Highlands

Sunny. Highs 72 to 80.

Tonight 6 Jul Beaverhead/Lemhi Highlands

Mostly clear. Lows 45 to 55.

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Threemile Reservoir Temperature Statistics

July Temperature

Rexburg, Rexburg-Madison County Airport (40.4 miles)

  • Lowest 1 July, 2025

    54 °F

  • Average July

    71.8 °F

  • Highest 1 July, 2025

    95 °F

Climate (2020–Present)

Rexburg, Rexburg-Madison County Airport (40.4 miles)

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  • Average Low 2020–2025

    33.4 °F

  • Average 2020–2025

    45.4 °F

  • Average High 2020–2025

    57.5 °F
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