Chantilly Weather Forecast

    • 60
    • 75

    Rain Showers

    • 55
    • 65

    Rain Showers

    • 53
    • 63

    Chance Rain Showers

    • 50
    • 64

    Mostly Cloudy

    • 51
    • 65

    Partly Sunny

    • 53
    • 66

    Partly Sunny

Today 21 Sep Eastern Loudoun

Mostly cloudy. A chance of Showers this afternoon. Highs in the lower 70s. Northeast Winds 5 to 10 Mph. Chance of rain 50 percent.

Tonight 21 Sep Eastern Loudoun

Showers likely in the Evening, then Showers with a slight chance of Thunderstorms after midnight. Lows in the upper 50s. Northeast Winds 5 to 10 Mph. Chance of rain 90 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Chantilly Temperature Statistics

September Temperature

Washington/Dulles International Airport, DC (2.5 miles)

  • Lowest 15 September, 2026

    52.6 °F

  • Average September

    75.7 °F

  • Highest 1 September, 2026

    94.6 °F

Climate (2021–2026)

Washington/Dulles International Airport, DC (2.5 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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