Mystic Lake Weather Forecast

    • 47
    • 73

    Mostly Cloudy

    • 46
    • 64

    Rain Showers Likely

    • 50
    • 68

    Slight Chance Thunderstorms

    • 50
    • 74

    Partly Sunny

    • 46
    • 72

    Mostly Sunny

    • 45
    • 68

    Mostly Sunny

    • 45
    • 69

    Mostly Sunny

Today 16 Aug Northwest Beaverhead County

Haze in the morning. Sunny in the Morning, then mostly cloudy with a 40 percent chance of Thunderstorms in the afternoon. Highs 70 to 80. Southwest Winds up to 10 Mph increasing to 10 to 15 Mph in the afternoon.

Tonight 16 Aug Northwest Beaverhead County

Mostly cloudy with a 30 percent chance of Thunderstorms in the Evening, then partly cloudy after midnight. Haze after midnight. Lows 45 to 50. Northwest Winds up to 10 Mph shifting to the south after midnight.

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Mystic Lake Temperature Statistics

August Temperature

Butte, Bert Mooney Airport (51 miles)

  • Lowest 9 August, 2025

    39.7 °F

  • Average August

    62.5 °F

  • Highest 12 August, 2025

    87.7 °F

Climate (2020–Present)

Butte, Bert Mooney Airport (51 miles)

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  • Average Low 2020–2025

    27.7 °F

  • Average 2020–2025

    41.6 °F

  • Average High 2020–2025

    55 °F
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