Great Falls Weather Forecast

    • 48
    • 71

    Chance Rain Showers

    • 43
    • 69

    Rain Showers Likely

    • 49
    • 76

    Chance Rain

    • 43
    • 65

    Chance Rain

    • 52
    • 81

    Partly Sunny

    • 47
    • 78

    Partly Sunny

    • 48
    • 76

    Partly Sunny

Today 6 May Cascade County below 5000ft

Warmer, sunny. Highs in the upper 60s. West Winds 10 to 15 Mph with Gusts to around 30 Mph.

Tonight 6 May Cascade County below 5000ft

Not as cool. Mostly cloudy. Slight chance of Thunderstorms in the Evening, then chance of rain Showers and slight chance of Thunderstorms after midnight. Lows in the upper 40s. West Winds 5 to 15 Mph. Gusts up to 30 Mph in the evening. Chance of precipitation 50 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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