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      Elev 373 ft, 38.890 °N 77.425 °W

      Chantilly, VA

      Chantilly Station77°
      Updated: 10:31 PM EDT on September 20, 2026 (GMT -4)
      6 minutes ago
      83°
      69°
      77
      Feels Like 78
      Mostly Cloudy
      N
      5
      Lower temperature is expected tomorrow
      50
      50
      575
      90
      50
      7
      0 mph
      50
      50
      50
      50
      50
      50
      Radar · Now
        Hyper-local data from Weather Underground's network of
        400,000+ personal weather stations worldwide
        Tonight
        Sun 09/20
        Low 65°f
         17% Precip. / 0 in
        Mostly cloudy skies early, then partly cloudy after midnight. Slight chance of a rain shower. Low around 65F. Winds N at 5 to 10 mph.
        Tomorrow
        Mon 09/21
        High 69°f
         49% Precip. / 0.06 in
        Considerable cloudiness. Occasional rain showers in the afternoon. High 69F. Winds NE at 5 to 10 mph. Chance of rain 50%.
        Tomorrow night
        Mon 09/21
        Low 60°f
         88% Precip. / 0.28 in
        Periods of rain. Low around 60F. Winds ENE at 5 to 10 mph. Chance of rain 90%. Rainfall around a quarter of an inch.
        Hourly Forecast
        Now
        75°
        11PM
        74°
        12AM
        73°
        1AM
        72°
        2AM
        71°
        3AM
        70°
        4AM
        69°
        5AM
        69°
        6AM
        67°
        6:56AM
        Sunrise
        7AM
        66°
        8AM
        67°
        9AM
        67°
        10AM
        68°
        11AM
        69°
        12PM
        69°
        1PM
        69°
        2PM
        33%
        68°
        3PM
        49%
        67°
        4PM
        35%
        67°
        5PM
        66°
        6PM
        66°
        7PM
        65°
        7:08PM
        Sunset
        8PM
        63°
        9PM
        63°
        10PM
        64°
        Precipitation
        49%
        Pollen
        Ragweed Pollen
        High
        Air Quality
        53
        Moderate
        UV Index
        0
        Low
        Additional Conditions
        1. Pressure 29.92 in
        2. Visibility 10 miles
        3. Clouds Mostly Cloudy
        4. Dew Point69°F
        5. Humidity 83%
        6. Rainfall 0.07 in
        7. Snow Depth 0 in
         KIAD Station History
        Almanac for September 21, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 83°F 77°F 92°F 1998
        4. Low 69°F 56°F 33°F 1962
        5. Rain/Snow Depth
        6. Precipitation 0 in 3.1 in -
        7. Snow 0 in 0 in -
        Almanac for September 22, 2026
        1. Forecast Average Record
        2. Temperature
        3. High 74°F 77°F 94°F
        4. Low 69°F 56°F 35°F
        Astronomy
        1. Sun Rise Set
        2. Actual Time 6:56 AM 7:08 PM
        3. Civil Twilight 6:29 AM 7:34 PM
        4. Nautical Twilight 5:58 AM 8:05PM
        5. Astronomical Twilight 5:27 AM 8:37 PM
        1. Length of Visible Light 13h 4m
        2. Length of Day 12h 11m
        3. Tomorrow will be 2 minutes 30 seconds shorter
        1. Moon 4:42 PM 1:29 AM
        2. Waxing Gibbous77% of the Moon is Illuminated
        Sep 26
        Full Moon
        Oct 3
        Waning Half Last Qtr
        Oct 10
        New Moon
        Oct 18
        Waxing Half First Qtr
        Precipitation
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