Cannon Lake Weather Forecast

    • 48
    • 71

    Mostly Sunny

    • 51
    • 75

    Mostly Sunny

    • 50
    • 76

    Partly Sunny

    • 52
    • 74

    Partly Sunny

    • 49
    • 67

    Mostly Sunny

    • 49
    • 70

    Mostly Sunny

Today 17 Sep Big Belt

Partly cloudy in the morning then becoming sunny. Patchy fog in the morning. Highs 60 to 70. East Winds up to 10 Mph.

Tonight 17 Sep Big Belt

Mostly clear. Lows 45 to 50. Southeast Winds up to 10 Mph.

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Cannon Lake Temperature Statistics

September Temperature

Helena Regional Airport (31.1 miles)

  • Lowest 5 September, 2025

    46 °F

  • Average September

    65.7 °F

  • Highest 3 September, 2025

    91.9 °F

Climate (2020–Present)

Helena Regional Airport (31.1 miles)

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  • Average Low 2020–2025

    36.1 °F

  • Average 2020–2025

    47.5 °F

  • Average High 2020–2025

    59.4 °F
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