Great Falls Weather Forecast

    • 54
    • 73

    Chance Rain Showers

    • 52
    • 81

    Rain Showers Likely

    • 44
    • 63

    Rain Showers Likely

    • 48
    • 65

    Partly Sunny

    • 52
    • 68

    Rain Showers Likely

    • 51
    • 69

    Chance Rain Showers

Today 9 May Central and Southeast Montgomery

Mostly cloudy. Scattered Showers and Thunderstorms this afternoon. Highs in the lower 70s. Southwest Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 50 percent.

Tonight 9 May Central and Southeast Montgomery

Partly cloudy. Scattered Showers and Thunderstorms in the evening. Lows in the mid 50s. South Winds around 5 Mph in the Evening, becoming light and variable. Chance of rain 40 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Great Falls Temperature Statistics

May Temperature

Washington/Dulles International Airport, DC (9.3 miles)

  • Lowest 1 May, 2026

    38.6 °F

  • Average May

    59.1 °F

  • Highest 5 May, 2026

    85.6 °F

Climate (2021–Present)

Washington/Dulles International Airport, DC (9.3 miles)

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  • Average Low 2021–2026

    47.5 °F

  • Average 2021–2026

    58.2 °F

  • Average High 2021–2026

    68.6 °F
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