Potomac River - Four Mile Run Entrance Weather Forecast

    • 73
    • 88

    Thunderstorms

    • 74
    • 87

    Rain Showers Likely

    • 71
    • 92

    Chance Thunderstorms

    • 68
    • 85

    Partly Sunny

    • 69
    • 85

    Slight Chance Thunderstorms

    • 72
    • 88

    Chance Rain Showers

Today 18 Jul Arlington/Falls Church/Alexandria

Partly sunny. A chance of Showers and Thunderstorms in the afternoon. Highs in the upper 80s. North Winds around 5 Mph, becoming northwest in the afternoon. Chance of rain 40 percent.

Tonight 18 Jul Arlington/Falls Church/Alexandria

Partly cloudy. Lows in the mid 70s. Northwest Winds around 5 Mph.

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  • Temperature Real-Time

Potomac River - Four Mile Run Entrance Temperature Statistics

July Temperature

Washington/Reagan National Airport, DC (0.6 miles)

  • Lowest 5 July, 2025

    69.7 °F

  • Average July

    81.3 °F

  • Highest 8 July, 2025

    95.6 °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

    69.2 °F
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