Cannon Lake Weather Forecast

    • 49
    • 71

    Mostly Sunny

    • 52
    • 72

    Partly Sunny

    • 43
    • 73

    Partly Sunny

    • 26
    • 49

    Snow

    • 24
    • 31

    Snow Likely

    • 30
    • 40

    Partly Sunny

Today 7 Oct Big Belt

Sunny. Highs 64 to 72. West Winds up to 10 Mph with Gusts to around 25 Mph.

Tonight 7 Oct Big Belt

Mostly clear. Lows in the mid 40s. Southwest Winds up to 5 Mph. Gusts up to 25 Mph after midnight.

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Cannon Lake Temperature Statistics

October Temperature

Helena Regional Airport (31.1 miles)

  • Lowest 4 October, 2026

    39.9 °F

  • Average October

    58.6 °F

  • Highest 2 October, 2026

    78.7 °F

Climate (2021–2026)

Helena Regional Airport (31.1 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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