Great Falls Weather Forecast

    • 49
    • 71

    Increasing Clouds

    • 50
    • 67

    Mostly Cloudy

    • 49
    • 72

    Mostly Sunny

    • 47
    • 75

    Partly Sunny

    • 49
    • 67

    Mostly Cloudy

    • 54
    • 68

    Chance Rain Showers

    • 55
    • 69

    Slight Chance Rain Showers

Today 27 Oct Central and Southeast Montgomery

Sunny. Highs in the upper 60s. Northeast Winds around 5 Mph.

Tonight 27 Oct Central and Southeast Montgomery

Mostly clear. Patchy fog after midnight. Lows in the upper 40s. East Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Great Falls Temperature Statistics

October Temperature

Washington/Dulles International Airport, DC (9.3 miles)

  • Lowest 19 October, 2026

    36.6 °F

  • Average October

    61.2 °F

  • Highest 2 October, 2026

    89.7 °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

    58.2 °F

  • Average High 2021–2026

    68.6 °F
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