Chantilly, VA 20151 Weather

Fairfax County12:20 PM EDT38.89°N, 77.45°W

Current conditions

Sunny
58°
Sunny
Feels like 58°
High 66°·Low 36°
WindNE 1 mph
Humidity59%
Dew point44°
Visibility10 mi
Cloud cover3%
UV index4 Moderate
Sunrise7:30 AM
Sunset6:19 PM

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

Forecast

10-day

  • Sunday

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

  • Sunday Night

    Mostly clear, with a low around 36. Southwest wind around 1 mph.

  • Monday

    Patchy frost before 9am. Sunny, with a high near 69.

National Weather Service forecast updated 1 day ago.

Hourly

Hourly forecast
  1. Now Sunny 58°
  2. 1 PM Sunny 61°
  3. 2 PM Sunny 63°
  4. 3 PM Sunny 65°
  5. 4 PM Sunny 66°
  6. 5 PM Sunny 64°
  7. 6 PM Clear 61°
  8. 7 PM Clear 56°
  9. 8 PM Clear 51°
  10. 9 PM Clear 48°
  11. 10 PM Clear 46°
  12. 11 PM Clear 44°
  13. Mon12 AM Clear 43°
  14. 1 AM Clear 42°
  15. 2 AM Clear 41°
  16. 3 AM Mostly Clear 40°
  17. 4 AM Mostly Clear 39°
  18. 5 AM Mostly Clear 39°
  19. 6 AM Patchy Frost 37°
  20. 7 AM Patchy Frost 36°
  21. 8 AM Patchy Frost 37°
  22. 9 AM Sunny 42°
  23. 10 AM Sunny 49°
  24. 11 AM Sunny 55°

10-day forecast

Details
  1. TonightOct 23 Mostly Clear Mostly Clear37°
  2. SatOct 24 Patchy Fog then Sunny Patchy Fog then Sunny36°64°
  3. TodayOct 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

54
Moderate
Fine particles (PM2.5)

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

Forecast

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

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 7:30 AM
Sunset 6:19 PM
Daylight 10 h 49 min (−2 min 20 s tomorrow)
Full Moon · 100% lit
Moonrise 5:39 PM Moonset 6:52 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low64° / 42°
Month to date3.61 in (normal 2.87 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 2 hrs ago

What Has Changed

The growing season ended for Frederick MD and western Loudoun Counties. Otherwise little to no change needed to the forecast this morning.

Key Messages

- 1) Below normal low temperatures give way to a warming trend early this week.

- 2) Above normal temperatures and dry conditions continue through the end of the week.

Discussion

KEY MESSAGE 1...Below normal low temperatures give way to a warming trend early this week.

High pressure will drift southwest through Monday. As a result, expect a continuation of frost and freeze conditions tonight with seasonable temperatures during the daylight hours.

After the chilly start, temperatures will rebound well into the 60s for much of the area this afternoon. Some stratocumulus are possible at times, but may ultimately be thin and transient.

As the high drifts southwest tonight, low-level flow will turn westerly allowing for less of a marine influence. This should set us up for one more good radiational cooling night before temperatures warm under return flow early in the workweek. Tonight will be more of a ridge- valley split type of night with cooler conditions in the valleys/cold pockets/locations along and east of I-95 compared to the ridge tops given the sharp surface inversion/decoupling.

Only minor changes have been made to the previous min temperature forecasts, which are near or below the coldest guidance which performs best in radiational cooling (MOS, NBM 10th percentile and Canadian Regional).

Expect temperatures to rise above normal (upper 60s to lower 70s) by Monday afternoon as the warming airmass mixes to the surface. Minimal cloud cover and light winds will remain persistent.

Aviation

Expect VFR conditions today with some stratocu possible. NAM and related guidance continues to show more widespread low CIGS and fog late tonight into early Monday morning, with at least some hint of this in other guidance and forecast soundings.

Winds will be light out of the NE this morning shifting to SE this afternoon, then W overnight. W/NW winds AOB 10 kts Monday.

P6SM SKC with light and variable winds as high pressure dominates. A dry cold front will cross the area late Monday night with winds shifting to 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 4Conservative index and reflects what the press published. Terms of use. How to use Weather