Washington Dulles International Airport Weather Forecast

    • 64
    • 86

    Increasing Clouds

    • 70
    • 89

    Chance Thunderstorms

    • 61
    • 84

    Partly Sunny

    • 64
    • 80

    Mostly Cloudy

    • 64
    • 83

    Rain Showers Likely

    • 64
    • 80

    Chance Rain Showers

    • 62
    • 78

    Chance Rain Showers

Today 16 Sep Eastern Loudoun

Mostly cloudy with a 40 percent chance of Showers. Highs in the lower 70s.

Tonight 16 Sep Eastern Loudoun

Partly cloudy. Lows in the mid 60s. South Winds around 5 Mph.

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Washington Dulles International Airport Temperature Statistics

September Temperature

Washington/Dulles International Airport, DC (0.6 miles)

  • Lowest 8 September, 2026

    57.7 °F

  • Average September

    77.2 °F

  • Highest 1 September, 2026

    94.6 °F

Climate (2021–2026)

Washington/Dulles International Airport, DC (0.6 miles)

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  • Average Low 2021–2026

    47.6 °F

  • Average 2021–2026

    58.3 °F

  • Average High 2021–2026

    68.6 °F
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