Cannon Lake Weather Forecast

    • 57
    • 79

    Patchy Smoke

    • 57
    • 84

    Mostly Sunny

    • 59
    • 80

    Partly Sunny

    • 57
    • 81

    Chance Rain Showers

    • 53
    • 76

    Slight Chance Thunderstorms

    • 56
    • 79

    Partly Sunny

Today 19 Aug Big Belt

Sunny. Highs 70 to 80. West Winds 5 to 15 Mph with Gusts to around 30 Mph.

Tonight 19 Aug Big Belt

Mostly clear. Lows in the lower 50s. Northwest Winds 5 to 10 Mph with Gusts to around 25 Mph shifting to the south after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cannon Lake Temperature Statistics

August Temperature

Helena Regional Airport (31.1 miles)

  • Lowest 4 August, 2026

    45.6 °F

  • Average August

    69.8 °F

  • Highest 1 August, 2026

    103.6 °F

Climate (2021–2026)

Helena Regional Airport (31.1 miles)

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  • Average Low 2021–2026

    36.3 °F

  • Average 2021–2026

    47.9 °F

  • Average High 2021–2026

    59.9 °F
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