Cannon Lake Weather Forecast

    • 40
    • 80

    Severe Tstms

    • 40
    • 56

    Windy

    • 37
    • 55

    Breezy

    • 32
    • 53

    Chance Rain/Snow

    • 31
    • 40

    Snow Showers Likely

    • 33
    • 47

    Slight Chance Rain/Snow

    • 37
    • 54

    Partly Sunny

Today 13 May Big Belt

Windy, warmer. Partly sunny. Slight chance of rain Showers early in the Afternoon, then chance of Thunderstorms late in the afternoon. Some Thunderstorms may produce gusty Winds late in the afternoon. Highs 73 to 83. Southwest Winds 15 to 30 Mph with Gusts to around 55 Mph. Chance of precipitation 50 percent.

Tonight 13 May Big Belt

Windy. Mostly cloudy with rain Showers likely and chance of Thunderstorms early in the Evening, then partly cloudy with slight chance of rain Showers late in the evening. Partly cloudy after midnight. Some Thunderstorms may be severe. Lows in the upper 30s. West Winds 20 to 35 Mph. Gusts up to 80 Mph increasing to 90 Mph after midnight. Chance of precipitation 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cannon Lake Temperature Statistics

May Temperature

Helena Regional Airport (31.1 miles)

  • Lowest 6 May, 2026

    27.6 °F

  • Average May

    55.4 °F

  • Highest 10 May, 2026

    79.6 °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

    60.1 °F
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