Potomac River - Four Mile Run Entrance Weather Forecast

    • 7
    • 24

    Chance Snow

    • 6
    • 23

    Mostly Sunny

    • 9
    • 22

    Mostly Cloudy

    • 13
    • 19

    Chance Snow

    • 16
    • 25

    Partly Sunny

    • 17
    • 33

    Partly Sunny

Today 28 Jan Arlington/Falls Church/Alexandria

Mostly cloudy with a 20 percent chance of snow. Highs in the lower 20s. West Winds around 5 Mph.

Tonight 28 Jan Arlington/Falls Church/Alexandria

Mostly cloudy with a slight chance of snow in the Evening, then mostly clear after midnight. Cold with Lows around 7 above. Northwest Winds around 5 Mph. Chance of snow 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Potomac River - Four Mile Run Entrance Temperature Statistics

January Temperature

Washington/Reagan National Airport, DC (0.6 miles)

  • Lowest 24 January, 2026

    10 °F

  • Average January

    36.6 °F

  • Highest 7 January, 2026

    63.6 °F

Climate (2021–Present)

Washington/Reagan National Airport, DC (0.6 miles)

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  • Average Low 2021–2026

    52.4 °F

  • Average 2021–2026

    60.3 °F

  • Average High 2021–2026

    69.1 °F
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