Great Falls Weather Forecast

    • 43
    • 65

    Becoming Sunny

    • 53
    • 69

    Partly Sunny

    • 54
    • 73

    Chance Rain Showers

    • 52
    • 78

    Rain Showers Likely

    • 45
    • 64

    Partly Sunny

    • 49
    • 65

    Chance Rain Showers

    • 51
    • 69

    Rain Showers Likely

Today 7 May Central and Southeast Montgomery

Mostly sunny. Highs in the mid 60s. Northwest Winds around 5 Mph.

Tonight 7 May Central and Southeast Montgomery

Mostly cloudy in the Evening, then clearing. Lows in the mid 40s. West Winds around 5 Mph.

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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

    58.1 °F

  • Highest 5 May, 2026

    84 °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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