Great Falls Weather Forecast

    • 53
    • 70

    Increasing Clouds

    • 53
    • 72

    Chance Rain Showers

    • 52
    • 79

    Rain Showers

    • 45
    • 62

    Slight Chance Rain Showers

    • 48
    • 64

    Partly Sunny

    • 50
    • 66

    Rain Showers Likely

Today 8 May Central and Southeast Montgomery

Sunny. Highs around 70. West Winds 5 to 10 Mph with Gusts up to 25 Mph.

Tonight 8 May Central and Southeast Montgomery

Mostly cloudy in the Evening, then becoming partly cloudy. Lows in the lower 50s. South Winds 5 to 10 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

    59.5 °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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