Great Falls Weather Forecast

    • 54
    • 74

    Breezy

    • 42
    • 68

    Partly Sunny

    • 46
    • 65

    Mostly Cloudy

    • 46
    • 75

    Partly Sunny

    • 42
    • 67

    Partly Sunny

    • 46
    • 73

    Partly Sunny

Today 29 Sep Cascade County below 5000ft

Windy, sunny. Highs in the lower 70s. Southwest Winds 15 to 35 Mph with Gusts to around 50 Mph.

Tonight 29 Sep Cascade County below 5000ft

Breezy. Partly cloudy in the evening then becoming mostly cloudy. Lows in the mid 50s. Southwest Winds 15 to 25 Mph with Gusts to around 40 Mph.

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Great Falls Temperature Statistics

September Temperature

Great Falls, Great Falls International Airport (3.7 miles)

  • Lowest 26 September, 2026

    37 °F

  • Average September

    60.2 °F

  • Highest 25 September, 2026

    88.6 °F

Climate (2021–2026)

Great Falls, Great Falls International Airport (3.7 miles)

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  • Average Low 2021–2026

    34.3 °F

  • Average 2021–2026

    46.9 °F

  • Average High 2021–2026

    59.1 °F
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