Cannon Lake Weather Forecast

    • 53
    • 63

    Rain Showers

    • 48
    • 69

    Chance Thunderstorms

    • 53
    • 75

    Mostly Sunny

    • 57
    • 82

    Sunny

    • 57
    • 84

    Mostly Sunny

    • 55
    • 83

    Partly Sunny

    • 56
    • 82

    Partly Sunny

Today 21 Jul Big Belt

Mostly cloudy. Rain Showers likely and chance of Thunderstorms in the afternoon. Highs 70 to 80. Northeast Winds 5 to 15 Mph. Chance of precipitation 70 percent.

Tonight 21 Jul Big Belt

Mostly cloudy. Rain Showers likely and chance of Thunderstorms in the Evening, then slight chance of Thunderstorms after midnight. Lows 50 to 55. North Winds 5 to 15 Mph shifting to the west after midnight. Chance of precipitation 70 percent.

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Cannon Lake Temperature Statistics

July Temperature

Helena Regional Airport (31.1 miles)

  • Lowest 5 July, 2025

    49.6 °F

  • Average July

    71.9 °F

  • Highest 8 July, 2025

    97.6 °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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