Potomac River - Alexandria Weather Forecast

    • 67
    • 84

    Rain Showers

    • 68
    • 79

    Rain Showers

    • 65
    • 85

    Mostly Sunny

    • 64
    • 84

    Mostly Sunny

    • 67
    • 84

    Mostly Sunny

    • 70
    • 87

    Chance Rain Showers

    • 70
    • 86

    Chance Thunderstorms

Today 21 Aug Arlington/Falls Church/Alexandria

Mostly sunny. Highs in the mid 80s. Northeast Winds around 5 Mph.

Tonight 21 Aug Arlington/Falls Church/Alexandria

Widespread Showers with isolated Thunderstorms after midnight. Lows in the upper 60s. East Winds around 5 Mph in the Evening, becoming light and variable. Chance of rain near 100 percent.

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Potomac River - Alexandria Temperature Statistics

August Temperature

Washington/Reagan National Airport, DC (2.5 miles)

  • Lowest 19 August, 2026

    70 °F

  • Average August

    82.2 °F

  • Highest 9 August, 2026

    94.6 °F

Climate (2021–2026)

Washington/Reagan National Airport, DC (2.5 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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