Potomac River - Four Mile Run Entrance Weather Forecast

    • 33
    • 43

    Decreasing Clouds

    • 39
    • 55

    Partly Sunny

    • 49
    • 62

    Chance Rain

    • 49
    • 69

    Mostly Cloudy

    • 47
    • 73

    Chance Rain

    • 33
    • 58

    Partly Sunny

Today 18 Mar Arlington/Falls Church/Alexandria

Partly sunny. Highs in the lower 40s. North Winds 5 to 10 Mph, becoming south this afternoon.

Tonight 18 Mar Arlington/Falls Church/Alexandria

Mostly clear in the Evening, then becoming partly cloudy. Lows in the lower 30s. South Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Potomac River - Four Mile Run Entrance Temperature Statistics

March Temperature

Washington/Reagan National Airport, DC (0.6 miles)

  • Lowest 2 March, 2026

    31.6 °F

  • Average March

    52.1 °F

  • Highest 11 March, 2026

    84.9 °F

Climate (2021–Present)

Washington/Reagan National Airport, DC (0.6 miles)

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  • Average Low 2021–2026

    52.4 °F

  • Average 2021–2026

    60.3 °F

  • Average High 2021–2026

    69.1 °F
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