Jackson Lake Weather Forecast

    • 41
    • 64

    Mostly Sunny

    • 42
    • 70

    Mostly Sunny

    • 46
    • 73

    Partly Sunny

    • 46
    • 73

    Mostly Sunny

    • 48
    • 77

    Partly Sunny

    • 43
    • 75

    Chance Rain

    • 38
    • 62

    Chance Rain

Today 20 Sep Meagher County Valleys

Partly sunny. Highs in the lower 60s.

Tonight 20 Sep Meagher County Valleys

Mostly clear. Lows around 40. East Winds up to 5 Mph.

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  • Temperature Real-Time

Jackson Lake Temperature Statistics

September Temperature

Helena Regional Airport (43.5 miles)

  • Lowest 15 September, 2026

    39.7 °F

  • Average September

    61.3 °F

  • Highest 10 September, 2026

    87.7 °F

Climate (2021–2026)

Helena Regional Airport (43.5 miles)

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  • Average Low 2021–2026

    36.4 °F

  • Average 2021–2026

    47.9 °F

  • Average High 2021–2026

    59.9 °F
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