Chantilly Weather Forecast

    • 61
    • 82

    Increasing Clouds

    • 60
    • 71

    Rain Showers Likely

    • 61
    • 70

    Rain Showers Likely

    • 61
    • 80

    Mostly Sunny

    • 61
    • 87

    Mostly Sunny

    • 60
    • 80

    Mostly Cloudy

Today 15 Sep Eastern Loudoun

Partly sunny. Highs in the lower 80s. Northeast Winds 5 to 10 Mph.

Tonight 15 Sep Eastern Loudoun

Mostly cloudy. Lows in the upper 50s. East Winds 5 to 10 Mph, becoming northeast after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Chantilly Temperature Statistics

September Temperature

Washington/Dulles International Airport, DC (2.5 miles)

  • Lowest 8 September, 2025

    48 °F

  • Average September

    68.7 °F

  • Highest 6 September, 2025

    93 °F

Climate (2020–Present)

Washington/Dulles International Airport, DC (2.5 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    47.7 °F

  • Average 2020–2025

    58.2 °F

  • Average High 2020–2025

    68.5 °F
Get WillyWeather+ to remove ads