Potomac River - Four Mile Run Entrance Weather Forecast

    • 44
    • 66

    Becoming Sunny

    • 42
    • 63

    Mostly Sunny

    • 41
    • 61

    Mostly Sunny

    • 41
    • 59

    Partly Sunny

    • 42
    • 60

    Partly Sunny

    • 42
    • 58

    Partly Sunny

Today 22 Oct Arlington/Falls Church/Alexandria

Mostly sunny. Highs in the upper 60s. West Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 22 Oct Arlington/Falls Church/Alexandria

Mostly clear. Lows in the lower 40s. West Winds 5 to 10 Mph.

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Potomac River - Four Mile Run Entrance Temperature Statistics

October Temperature

Washington/Reagan National Airport, DC (0.6 miles)

  • Lowest 17 October, 2025

    46 °F

  • Average October

    63 °F

  • Highest 6 October, 2025

    81 °F

Climate (2020–Present)

Washington/Reagan National Airport, DC (0.6 miles)

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  • Average Low 2020–2025

    52.7 °F

  • Average 2020–2025

    60.5 °F

  • Average High 2020–2025

    69.3 °F
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