Potomac River - Four Mile Run Entrance Weather Forecast

    • 73
    • 89

    Thunderstorms

    • 67
    • 85

    Partly Sunny

    • 68
    • 81

    Mostly Cloudy

    • 68
    • 86

    Rain Showers Likely

    • 64
    • 77

    Chance Rain Showers

    • 61
    • 73

    Chance Rain Showers

Today 17 Sep Arlington/Falls Church/Alexandria

Mostly sunny. Scattered Showers and Thunderstorms this afternoon. Highs in the upper 80s. South Winds around 5 Mph. Chance of rain 40 percent.

Tonight 17 Sep Arlington/Falls Church/Alexandria

Mostly cloudy with scattered Showers and Thunderstorms in the Evening, then partly cloudy after midnight. Lows in the lower 70s. Southwest Winds around 5 Mph, becoming west after midnight. Chance of rain 30 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Potomac River - Four Mile Run Entrance Temperature Statistics

September Temperature

Washington/Reagan National Airport, DC (0.6 miles)

  • Lowest 7 September, 2026

    64.7 °F

  • Average September

    79.6 °F

  • Highest 1 September, 2026

    98.7 °F

Climate (2021–2026)

Washington/Reagan National Airport, DC (0.6 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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