Jackson Lake Weather Forecast

    • 32
    • 49

    Increasing Clouds

    • 38
    • 61

    Mostly Cloudy

    • 26
    • 48

    Chance Rain Showers

    • 34
    • 50

    Mostly Cloudy

    • 32
    • 52

    Mostly Cloudy

    • 36
    • 55

    Mostly Cloudy

Today 31 Oct Meagher County Valleys

Sunny. Highs 45 to 50. Southwest Winds up to 10 Mph.

Tonight 31 Oct Meagher County Valleys

Mostly cloudy. Lows 30 to 35. South Winds up to 10 Mph.

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Jackson Lake Temperature Statistics

October Temperature

Helena Regional Airport (43.5 miles)

  • Lowest 6 October, 2025

    24.1 °F

  • Average October

    45.6 °F

  • Highest 10 October, 2025

    75.9 °F

Climate (2020–Present)

Helena Regional Airport (43.5 miles)

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  • Average Low 2020–2025

    36.2 °F

  • Average 2020–2025

    47.6 °F

  • Average High 2020–2025

    59.5 °F
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