McMillan Weather Forecast

    • 27
    • 59

    Rain Showers

    • 36
    • 44

    Partly Sunny

    • 25
    • 49

    Partly Sunny

    • 30
    • 39

    Chance Rain

    • 37
    • 45

    Mostly Cloudy

    • 37
    • 51

    Slight Chance Rain

Today 19 Dec District of Columbia

Mostly cloudy late this Morning, then becoming partly sunny. Numerous Showers late this Morning, then isolated Showers this afternoon. Breezy with Highs around 60. Temperature falling to around 40 this afternoon. West Winds 15 to 25 Mph. Gusts up to 50 Mph this afternoon. Chance of rain 60 percent.

Tonight 19 Dec District of Columbia

Mostly clear and Blustery, cooler with Lows in the upper 20s. West Winds 20 to 25 Mph with Gusts up to 50 Mph, Diminishing to 5 to 10 Mph with Gusts up to 25 Mph after midnight.

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McMillan Temperature Statistics

December Temperature

Washington/Reagan National Airport, DC (5 miles)

  • Lowest 15 December, 2025

    18 °F

  • Average December

    34.3 °F

  • Highest 17 December, 2025

    50 °F

Climate (2020–Present)

Washington/Reagan National Airport, DC (5 miles)

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  • Average Low 2020–2025

    52.5 °F

  • Average 2020–2025

    60.3 °F

  • Average High 2020–2025

    69.1 °F
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