Threemile Reservoir Weather Forecast

    • 54
    • 85

    Decreasing Clouds

    • 52
    • 83

    Mostly Sunny

    • 52
    • 83

    Mostly Sunny

    • 54
    • 84

    Mostly Sunny

    • 54
    • 82

    Chance Rain Showers

    • 52
    • 77

    Chance Rain Showers

Today 20 Aug Beaverhead/Lemhi Highlands

Mostly sunny with a slight chance of rain Showers. Highs 82 to 90.

Tonight 20 Aug Beaverhead/Lemhi Highlands

Mostly clear. A slight chance of rain Showers in the evening. Lows 49 to 59.

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Threemile Reservoir Temperature Statistics

August Temperature

Rexburg, Rexburg-Madison County Airport (40.4 miles)

  • Lowest 9 August, 2025

    44.7 °F

  • Average August

    69.9 °F

  • Highest 13 August, 2025

    95.6 °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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