Potomac River - Alexandria Weather Forecast

    • 72
    • 90

    Mostly Sunny

    • 61
    • 90

    Rain Showers

    • 56
    • 76

    Partly Sunny

    • 55
    • 76

    Mostly Sunny

    • 58
    • 76

    Mostly Sunny

    • 59
    • 76

    Partly Sunny

Today 5 Sep Arlington/Falls Church/Alexandria

Sunny. Highs in the upper 80s. Southwest Winds 5 to 10 Mph.

Tonight 5 Sep Arlington/Falls Church/Alexandria

Partly cloudy. Lows in the mid 60s. Southwest Winds 5 to 10 Mph.

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Potomac River - Alexandria Temperature Statistics

September Temperature

Washington/Reagan National Airport, DC (2.5 miles)

  • Lowest 1 September, 2025

    59 °F

  • Average September

    69.9 °F

  • Highest 1 September, 2025

    80.1 °F

Climate (2020–Present)

Washington/Reagan National Airport, DC (2.5 miles)

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  • Average Low 2020–2025

    52.6 °F

  • Average 2020–2025

    60.4 °F

  • Average High 2020–2025

    69.2 °F
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