Cannon Lake Weather Forecast

    • 36
    • 54

    Increasing Clouds

    • 36
    • 59

    Mostly Cloudy

    • 40
    • 58

    Mostly Cloudy

    • 27
    • 57

    Chance Rain/Snow

    • 25
    • 40

    Chance Snow

    • 32
    • 48

    Rain/Snow Likely

Today 27 Mar Big Belt

Not as cool. Sunny. Highs 45 to 55. South Winds up to 15 Mph with Gusts to around 35 Mph.

Tonight 27 Mar Big Belt

Not as cold. Partly cloudy. Lows in the mid 30s. South Winds up to 10 Mph with Gusts to around 35 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cannon Lake Temperature Statistics

March Temperature

Helena Regional Airport (31.1 miles)

  • Lowest 15 March, 2026

    4.6 °F

  • Average March

    42.2 °F

  • Highest 20 March, 2026

    77.6 °F

Climate (2021–Present)

Helena Regional Airport (31.1 miles)

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  • Average Low 2021–2026

    36.5 °F

  • Average 2021–2026

    48.1 °F

  • Average High 2021–2026

    60 °F
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