Great Falls Weather Forecast

    • 43
    • 77

    Becoming Sunny

    • 50
    • 80

    Mostly Sunny

    • 55
    • 92

    Chance Thunderstorms

    • 48
    • 75

    Chance Rain Showers

    • 47
    • 75

    Partly Sunny

    • 41
    • 68

    Chance Rain

Today 11 May Cascade County below 5000ft

Mostly sunny. Highs in the mid 70s. West Winds 5 to 10 Mph shifting to the northwest 10 to 20 Mph in the afternoon. Gusts up to 35 Mph.

Tonight 11 May Cascade County below 5000ft

Mostly clear. Lows in the lower 40s. North Winds 5 to 15 Mph with Gusts to around 30 Mph shifting to the east up to 5 Mph after midnight.

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Great Falls Temperature Statistics

May Temperature

Great Falls, Great Falls International Airport (3.7 miles)

  • Lowest 6 May, 2026

    23.6 °F

  • Average May

    52.2 °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

    59.2 °F
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