Great Falls Weather Forecast

    • 75
    • 91

    Slight Chance Thunderstorms

    • 73
    • 88

    Chance Thunderstorms

    • 75
    • 91

    Chance Thunderstorms

    • 69
    • 90

    Chance Thunderstorms

    • 63
    • 84

    Mostly Sunny

    • 60
    • 81

    Mostly Sunny

Today 1 Sep Central and Southeast Montgomery

Mostly sunny. A slight chance of Showers and Thunderstorms in the afternoon. Hot with Highs in the lower 90s. West Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 1 Sep Central and Southeast Montgomery

Partly cloudy in the Evening, then becoming mostly cloudy. A slight chance of Showers. Isolated Thunderstorms. Lows in the mid 70s. West Winds 5 to 10 Mph. Chance of rain 20 percent.

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Great Falls Temperature Statistics

September Temperature

Washington/Dulles International Airport, DC (9.3 miles)

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Climate (2021–2026)

Washington/Dulles International Airport, DC (9.3 miles)

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  • Average Low 2021–2026

    47.6 °F

  • Average 2021–2026

    58.2 °F

  • Average High 2021–2026

    68.6 °F
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