Potomac River - Belle Haven Marina Weather Forecast

    • 54
    • 64

    Chance Rain Showers

    • 52
    • 66

    Mostly Cloudy

    • 56
    • 70

    Partly Sunny

    • 57
    • 73

    Mostly Cloudy

    • 57
    • 72

    Partly Sunny

    • 57
    • 75

    Partly Sunny

Today 23 Sep Arlington/Falls Church/Alexandria

Cloudy. Showers Likely, mainly in the morning. Highs in the lower 60s. Northeast Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 60 percent.

Tonight 23 Sep Arlington/Falls Church/Alexandria

Mostly cloudy. A slight chance of Showers in the evening. Lows in the mid 50s. Northeast Winds around 10 Mph with Gusts up to 20 Mph. Chance of rain 20 percent.

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  • Temperature Real-Time

Potomac River - Belle Haven Marina Temperature Statistics

September Temperature

Washington/Reagan National Airport, DC (5 miles)

  • Lowest 15 September, 2026

    58.6 °F

  • Average September

    78.4 °F

  • Highest 1 September, 2026

    98.7 °F

Climate (2021–2026)

Washington/Reagan National Airport, DC (5 miles)

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  • Average Low 2021–2026

    52.4 °F

  • Average 2021–2026

    60.5 °F

  • Average High 2021–2026

    69.3 °F
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