National Harbor Weather Forecast

    • 67
    • 78

    Rain Showers

    • 64
    • 84

    Slight Chance Thunderstorms

    • 62
    • 82

    Mostly Sunny

    • 65
    • 83

    Partly Sunny

    • 69
    • 86

    Chance Rain Showers

    • 70
    • 85

    Rain Showers Likely

Today 22 Aug Arlington/Falls Church/Alexandria

Cloudy. Numerous Showers late this Morning, then scattered Showers with isolated Thunderstorms this afternoon. Highs in the upper 70s. East Winds around 5 Mph. Chance of rain 70 percent.

Tonight 22 Aug Arlington/Falls Church/Alexandria

Mostly cloudy. Showers likely with a chance of Thunderstorms in the Evening, then a chance of Showers with a slight chance of Thunderstorms after midnight. Lows in the upper 60s. East Winds around 5 Mph, becoming west after midnight. Chance of rain 60 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

National Harbor Temperature Statistics

August Temperature

Washington/Reagan National Airport, DC (4.3 miles)

  • Lowest 20 August, 2026

    70 °F

  • Average August

    82.1 °F

  • Highest 9 August, 2026

    94.6 °F

Climate (2021–2026)

Washington/Reagan National Airport, DC (4.3 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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