Cannon Lake Weather Forecast

    • 13
    • 44

    Snow Likely

    • -1
    • 19

    Snow Likely

    • 18
    • 23

    Mostly Sunny

    • 28
    • 34

    Partly Sunny

    • 30
    • 39

    Mostly Cloudy

    • 25
    • 40

    Mostly Cloudy

Today 26 Dec Big Belt

Windy. Partly sunny with a 20 percent chance of snow. Highs 37 to 45. South Winds 15 to 20 Mph shifting to the southwest 15 to 30 Mph in the afternoon. Gusts up to 50 Mph.

Tonight 26 Dec Big Belt

Windy. Mostly cloudy. A 50 percent chance of snow Showers and rain Showers. Highs 37 to 45. Lows 16 to 35. Southwest Winds 10 to 30 Mph with Gusts to around 50 Mph.

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Cannon Lake Temperature Statistics

December Temperature

Helena Regional Airport (31.1 miles)

  • Lowest 1 December, 2025

    3 °F

  • Average December

    35.8 °F

  • Highest 10 December, 2025

    61 °F

Climate (2020–Present)

Helena Regional Airport (31.1 miles)

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  • Average Low 2020–2025

    36.3 °F

  • Average 2020–2025

    47.7 °F

  • Average High 2020–2025

    59.6 °F
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