Great Falls Weather Forecast

    • 67
    • 84

    Rain Showers

    • 67
    • 83

    Partly Sunny

    • 66
    • 83

    Partly Sunny

    • 68
    • 85

    Partly Sunny

    • 70
    • 87

    Mostly Cloudy

    • 70
    • 86

    Chance Thunderstorms

Today 28 Jul Central and Southeast Montgomery

Numerous Showers and scattered Thunderstorms. Highs in the lower 80s. South Winds 10 to 15 Mph. Chance of rain 70 percent.

Tonight 28 Jul Central and Southeast Montgomery

Partly cloudy. Lows in the upper 60s. South Winds around 5 Mph.

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Great Falls Temperature Statistics

July Temperature

Washington/Dulles International Airport, DC (9.3 miles)

  • Lowest 24 July, 2026

    57.7 °F

  • Average July

    79.8 °F

  • Highest 4 July, 2026

    99.6 °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

    58.2 °F

  • Average High 2021–2026

    68.6 °F
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