Great Falls Weather Forecast

    • 42
    • 46

    Slight Chance Rain

    • 26
    • 62

    Chance Rain

    • 24
    • 34

    Partly Sunny

    • 28
    • 43

    Mostly Cloudy

    • 23
    • 40

    Partly Sunny

    • 23
    • 36

    Partly Sunny

Today 28 Dec Central and Southeast Montgomery

Mostly cloudy. A slight chance of rain in the afternoon. Highs in the upper 40s. South Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 28 Dec Central and Southeast Montgomery

Cloudy. Lows in the lower 40s. South Winds 10 to 15 Mph with Gusts up to 25 Mph.

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Great Falls Temperature Statistics

December Temperature

Washington/Dulles International Airport, DC (9.3 miles)

  • Lowest 9 December, 2025

    14 °F

  • Average December

    34.9 °F

  • Highest 19 December, 2025

    59 °F

Climate (2020–Present)

Washington/Dulles International Airport, DC (9.3 miles)

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  • Average Low 2020–2025

    47.6 °F

  • Average 2020–2025

    58.2 °F

  • Average High 2020–2025

    68.4 °F
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