Great Falls Weather Forecast

    • 70
    • 88

    Rain Showers Likely

    • 70
    • 85

    Chance Rain Showers

    • 71
    • 88

    Chance Rain Showers

    • 66
    • 83

    Slight Chance Thunderstorms

    • 67
    • 83

    Slight Chance Thunderstorms

    • 71
    • 86

    Chance Thunderstorms

Today 11 Aug Central and Southeast Montgomery

Partly sunny. Showers likely with a chance of Thunderstorms in the afternoon. Highs in the upper 80s. West Winds 5 to 10 Mph. Chance of rain 40 percent.

Tonight 11 Aug Central and Southeast Montgomery

Mostly cloudy. Lows in the lower 70s. West Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Great Falls Temperature Statistics

August Temperature

Washington/Dulles International Airport, DC (9.3 miles)

  • Lowest 1 August, 2026

    65.6 °F

  • Average August

    79.8 °F

  • Highest 6 August, 2026

    91.7 °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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