Jack Mountain Weather Forecast

    • 46
    • 74

    Mostly Cloudy

    • 46
    • 63

    Clearing Late

    • 50
    • 67

    Mostly Sunny

    • 50
    • 73

    Mostly Sunny

    • 47
    • 71

    Mostly Sunny

    • 42
    • 65

    Mostly Sunny

    • 42
    • 63

    Mostly Sunny

Today 16 Aug Elkhorn and Boulder Mountains

Sunny in the Morning, then mostly cloudy with a 40 percent chance of Thunderstorms in the afternoon. Areas of smoke in the morning. Haze through the day. Highs 75 to 85. Southwest Winds 5 to 15 Mph.

Tonight 16 Aug Elkhorn and Boulder Mountains

Mostly cloudy with a 40 percent chance of Thunderstorms in the Evening, then partly cloudy after midnight. Haze through the night. Lows 50 to 55. West Winds up to 10 Mph.

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Jack Mountain Temperature Statistics

August Temperature

Helena Regional Airport (23 miles)

  • Lowest 7 August, 2025

    49.6 °F

  • Average August

    69.7 °F

  • Highest 12 August, 2025

    95.6 °F

Climate (2020–Present)

Helena Regional Airport (23 miles)

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  • Average Low 2020–2025

    36 °F

  • Average 2020–2025

    47.5 °F

  • Average High 2020–2025

    59.4 °F
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