Great Falls International Airport Weather Forecast

    • 46
    • 73

    Slight Chance Thunderstorms

    • 46
    • 78

    Mostly Sunny

    • 46
    • 79

    Sunny

    • 49
    • 80

    Partly Sunny

    • 55
    • 84

    Partly Sunny

    • 50
    • 76

    Partly Sunny

Today 16 Sep Cascade County below 5000ft

Mostly cloudy. Chance of rain in the Morning, then slight chance of Thunderstorms in the afternoon. Highs 70 to 75. Northwest Winds up to 10 Mph shifting to the northeast in the afternoon. Chance of precipitation 50 percent.

Tonight 16 Sep Cascade County below 5000ft

Mostly clear. Lows 45 to 50. East Winds up to 10 Mph shifting to the southwest after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Great Falls International Airport Temperature Statistics

September Temperature

Great Falls, Great Falls International Airport (0.6 miles)

  • Lowest 5 September, 2025

    39.9 °F

  • Average September

    65.3 °F

  • Highest 1 September, 2025

    90 °F

Climate (2020–Present)

Great Falls, Great Falls International Airport (0.6 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    34 °F

  • Average 2020–2025

    46.4 °F

  • Average High 2020–2025

    58.3 °F
Get WillyWeather+ to remove ads