Great Falls Weather Forecast

    • 45
    • 69

    Sunny

    • 42
    • 65

    Mostly Sunny

    • 45
    • 66

    Sunny

    • 39
    • 60

    Sunny

    • 39
    • 60

    Mostly Sunny

    • 42
    • 65

    Mostly Sunny

Today 20 Oct Central and Southeast Montgomery

Sunny. Highs in the upper 60s. North Winds around 10 Mph.

Tonight 20 Oct Central and Southeast Montgomery

Clear. Lows in the mid 40s. North Winds 5 to 10 Mph.

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Great Falls Temperature Statistics

October Temperature

Washington/Dulles International Airport, DC (9.3 miles)

  • Lowest 18 October, 2026

    37 °F

  • Average October

    64.4 °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

    58.3 °F

  • Average High 2021–2026

    68.6 °F
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