Chantilly, VA 20151 Weather

Fairfax County9:31 AM EDT38.89°N, 77.45°W

Current conditions

Sunny
41°
Sunny
Feels like 41°
High 64°·Low 36°
WindN 2 mph
Humidity100%
Dew point41°
Visibility9.4 mi
Cloud cover22%
UV index1 Low
Sunrise7:29 AM
Sunset6:20 PM

Forecast for this hour (no station report in the last two hours)

Forecast

10-day

  • Saturday

    Patchy fog before 7am, then patchy frost and patchy fog between 7am and 9am. Sunny, with a high near 64. Northeast wind 0 to 5 mph.

  • Saturday Night

    Mostly clear, with a low around 36. East wind 0 to 3 mph.

  • Sunday

    Patchy frost before 9am. Sunny, with a high near 66. Northeast wind around 1 mph.

National Weather Service forecast updated 10 hrs ago.

Hourly

Hourly forecast
  1. Now Sunny 41°
  2. 10 AM Sunny 48°
  3. 11 AM Sunny 52°
  4. 12 PM Sunny 56°
  5. 1 PM Sunny 59°
  6. 2 PM Sunny 61°
  7. 3 PM Sunny 62°
  8. 4 PM Sunny 63°
  9. 5 PM Sunny 61°
  10. 6 PM Mostly Clear 59°
  11. 7 PM Mostly Clear 54°
  12. 8 PM Mostly Clear 50°
  13. 9 PM Clear 47°
  14. 10 PM Clear 44°
  15. 11 PM Mostly Clear 43°
  16. Sun12 AM Clear 42°
  17. 1 AM Clear 42°
  18. 2 AM Clear 40°
  19. 3 AM Clear 40°
  20. 4 AM Mostly Clear 39°
  21. 5 AM Mostly Clear 38°
  22. 6 AM Patchy Frost 37°
  23. 7 AM Patchy Frost 37°
  24. 8 AM Patchy Frost 36°

10-day forecast

Details
  1. TonightOct 23 Mostly Clear Mostly Clear37°
  2. TodayOct 24 Patchy Fog then Sunny Patchy Fog then Sunny36°64°
  3. SunOct 25 Patchy Frost then Sunny Patchy Frost then Sunny36°66°
  4. MonOct 26 Patchy Frost then Sunny Patchy Frost then Sunny47°69°
  5. TueOct 27 Sunny Sunny46°69°
  6. WedOct 28 Partly Sunny Partly Sunny49°66°
  7. ThuOct 29 Partly Sunny Partly Sunny50°70°
  8. FriOct 30 Mostly Sunny Mostly Sunny71°
  9. SatOct 31 Partly cloudy Partly cloudy45°68°
  10. SunNov 1 Cloudy Cloudy48°69°

Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.

Radar

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Weather news near Chantilly

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Air quality

52
Moderate
Fine particles (PM2.5)

Acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.

Forecast

  • SatGood (44)
  • SunModerate (53)
  • MonGood (50)

Northern Virginia, VA reporting area · 1 hr ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.

Sun & moon

Sunrise 7:29 AM
Sunset 6:20 PM
Daylight 10 h 51 min (−2 min 20 s tomorrow)
Waxing Gibbous · 97% lit
Moonrise 5:11 PM Moonset 5:43 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low65° / 42°
Record high84° (2001)
Record low15° (1969)
Wettest1.69 in (2009)
Month to date3.61 in (normal 2.76 in)

Sterling-Dulles Airport Area, records since 1960. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in LWX, issued 7 hrs ago

What Has Changed

A Coastal Flood Advisory has been issued for Annapolis. Otherwise, there have been no significant changes to the forecast thinking for the next seven days.

Key Messages

- 1) Frost or freezing temperatures are possible in many areas tonight and Sunday night.

- 2) Dry weather continues through next week along with generally seasonable temperatures.

Discussion

KEY MESSAGE 1...Frost or freezing temperatures are possible in many areas tonight and Sunday night.

With a large area of Canadian high pressure building overhead through the weekend, conditions will likely become favorable for radiational cooling (light to calm winds, mainly clear skies and a cool background airmass). At the moment, it is unclear which night will be the coldest, although tonight (Saturday night) will have a slight advantage given the position of the high overhead.

The growing season for 2026 has ended along and west of the Blue Ridge and Catoctin Mountains, but continues east of there. Any headlines for frost/freeze conditions will only be issued where the growing season remains active.

For tonight, more widespread cold (possible frost/freeze) conditions are possible as high pressure settles more directly overhead. This would bring the frost/freeze threat for most areas outside the major urban centers (downtown DC/Baltimore) and immediate shore of the Chesapeake Bay. If the colder guidance verifies, then the growing season may end for more areas west of I-95 come early Sunday morning. The high will remain overhead through Monday morning, and the low-level airmass doesn't change appreciably, so frost/freeze conditions will be possible again Sunday night.

Did not make appreciable changes to the previous min temperature forecasts, which are near or below the coldest guidance which performs best in radiational cooling (MOS, NBM 10 percentile and Canadian Regional).

KEY MESSAGE 2...Dry weather continues through next week along with generally seasonable temperatures.

Aviation

VFR conditions are expected to prevail through early next week. There are some hints that a slight uptick in low-level moisture could lead to some patchy fog during the early morning hours through the weekend, though confidence in timing and extent of sub-VFR is low at this time. The NAM and related guidance is by far the most aggressive with this outcome, but is an outlier.

E to SE flow is expected today, with light to calm winds again tonight. Wind direction may be a bit variable, ranging from SE to NE as high pressure passes directly overhead Sunday.

P6SM SKC as high pressure dominates early next week. A dry cold front will cross the area late Monday night with winds shifting to N/NW Tuesday.

Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Search index and reflects what the press published. Terms of use.