Potomac River - Rosilie Island Weather Forecast

    • 20
    • 35

    Rain/Snow

    • 17
    • 39

    Mostly Sunny

    • 16
    • 29

    Mostly Sunny

    • 28
    • 40

    Partly Sunny

    • 23
    • 43

    Partly Sunny

    • 27
    • 38

    Partly Sunny

Today 18 Jan Arlington/Falls Church/Alexandria

A slight chance of rain in the morning. Snow likely. Snow accumulation around an inch. Highs in the mid 30s. North Winds 5 to 10 Mph. Chance of precipitation 70 percent.

Tonight 18 Jan Arlington/Falls Church/Alexandria

Partly cloudy with a chance of snow in the Evening, then mostly clear after midnight. Little or no additional snow accumulation. Lows in the lower 20s. Northwest Winds around 5 Mph. Chance of snow 30 percent.

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  • Temperature Real-Time

Potomac River - Rosilie Island Temperature Statistics

January Temperature

Washington/Reagan National Airport, DC (3.7 miles)

  • Lowest 15 January, 2026

    23 °F

  • Average January

    39.7 °F

  • Highest 7 January, 2026

    63 °F

Climate (2021–Present)

Washington/Reagan National Airport, DC (3.7 miles)

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  • Average Low 2021–2026

    52.5 °F

  • Average 2021–2026

    60.3 °F

  • Average High 2021–2026

    69.1 °F
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