Great Falls International Airport Weather Forecast

    • 27
    • 41

    Increasing Clouds

    • 32
    • 45

    Mostly Sunny

    • 29
    • 49

    Mostly Sunny

    • 35
    • 48

    Mostly Cloudy

    • 34
    • 51

    Mostly Cloudy

    • 32
    • 48

    Mostly Cloudy

    • 31
    • 47

    Partly Sunny

Today 29 Dec Cascade County below 5000ft

Sunny. Highs in the mid 40s. Southwest Winds 5 to 15 Mph with Gusts to around 30 Mph.

Tonight 29 Dec Cascade County below 5000ft

Partly cloudy. Lows in the lower 30s. Southwest Winds 10 to 15 Mph with Gusts to around 30 Mph.

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Great Falls International Airport Temperature Statistics

December Temperature

Great Falls, Great Falls International Airport (0.6 miles)

  • Lowest 27 December, 2025

    -5.1 °F

  • Average December

    33.7 °F

  • Highest 14 December, 2025

    61 °F

Climate (2020–Present)

Great Falls, Great Falls International Airport (0.6 miles)

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  • Average Low 2020–2025

    34.1 °F

  • Average 2020–2025

    46.6 °F

  • Average High 2020–2025

    58.6 °F
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