Great Falls Weather Forecast

    • 43
    • 69

    Rain Showers Likely

    • 50
    • 76

    Chance Rain

    • 43
    • 68

    Chance Rain

    • 52
    • 81

    Partly Sunny

    • 47
    • 78

    Partly Sunny

    • 48
    • 76

    Partly Sunny

Today 7 May Cascade County below 5000ft

Mostly cloudy. Chance of rain Showers until late Afternoon, then chance of Thunderstorms late in the afternoon. Highs 64 to 70. West Winds 5 to 15 Mph. Chance of precipitation 50 percent.

Tonight 7 May Cascade County below 5000ft

Mostly cloudy with chance of rain Showers and slight chance of Thunderstorms in the Evening, then partly cloudy after midnight. Lows in the lower 40s. West Winds 5 to 10 Mph shifting to the southwest after midnight. Chance of precipitation 40 percent.

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Great Falls Temperature Statistics

May Temperature

Great Falls, Great Falls International Airport (3.7 miles)

  • Lowest 1 May, 2026

    34.6 °F

  • Average May

    53.1 °F

  • Highest 3 May, 2026

    76.6 °F

Climate (2021–Present)

Great Falls, Great Falls International Airport (3.7 miles)

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  • Average Low 2021–2026

    34.4 °F

  • Average 2021–2026

    47 °F

  • Average High 2021–2026

    59.1 °F
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