Great Falls Weather Forecast

    • 62
    • 83

    Mostly Sunny

    • 69
    • 87

    Partly Sunny

    • 69
    • 86

    Rain Showers Likely

    • 68
    • 86

    Partly Sunny

    • 68
    • 86

    Partly Sunny

    • 71
    • 87

    Slight Chance Thunderstorms

Today 25 Aug Central and Southeast Montgomery

Mostly sunny. Highs in the lower 80s. Northwest Winds 5 to 10 Mph.

Tonight 25 Aug Central and Southeast Montgomery

Mostly clear. Lows around 60. Northwest Winds around 5 Mph.

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Great Falls Temperature Statistics

August Temperature

Washington/Dulles International Airport, DC (9.3 miles)

  • Lowest 19 August, 2026

    62.7 °F

  • Average August

    79 °F

  • Highest 10 August, 2026

    92.6 °F

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

    58.3 °F

  • Average High 2021–2026

    68.6 °F
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