Great Falls Weather Forecast

    • 43
    • 65

    Rain Showers Likely

    • 54
    • 77

    Mostly Sunny

    • 47
    • 82

    Chance Rain Showers

    • 41
    • 63

    Chance Rain Showers

    • 38
    • 60

    Chance Rain Showers

    • 37
    • 55

    Chance Rain Showers

Today 8 Sep Cascade County below 5000ft

Mostly cloudy. Slight chance of rain Showers in the Morning, then chance of rain Showers in the afternoon. Highs in the lower 60s. West Winds 10 to 15 Mph with Gusts to around 30 Mph. Chance of Showers 50 percent.

Tonight 8 Sep Cascade County below 5000ft

Breezy. Partly cloudy. A 50 percent chance of rain Showers. Highs in the lower 60s. Lows 41 to 48. Southwest Winds 5 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 1 September, 2026

    46.7 °F

  • Average September

    65.1 °F

  • Highest 1 September, 2026

    86.6 °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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