Great Falls Weather Forecast

    • 71
    • 94

    Mostly Sunny

    • 73
    • 95

    Partly Sunny

    • 58
    • 94

    Rain Showers

    • 53
    • 68

    Chance Rain Showers

    • 56
    • 64

    Rain Showers Likely

    • 61
    • 74

    Rain Showers Likely

Today 18 May Central and Southeast Montgomery

Sunny, hot with Highs in the mid 90s. Southwest Winds 5 to 10 Mph.

Tonight 18 May Central and Southeast Montgomery

Mostly clear. Lows in the lower 70s. South Winds 5 to 10 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Great Falls Temperature Statistics

May Temperature

Washington/Dulles International Airport, DC (9.3 miles)

  • Lowest 8 May, 2026

    37.7 °F

  • Average May

    60.1 °F

  • Highest 5 May, 2026

    85.6 °F

Climate (2021–Present)

Washington/Dulles International Airport, DC (9.3 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    47.6 °F

  • Average 2021–2026

    58.2 °F

  • Average High 2021–2026

    68.6 °F
Get WillyWeather+ to remove ads