South Riding, VA Weather

Loudoun County5:42 AM EDT38.92°N, 77.50°WElevation 322 ft
Frost Advisory until 9:00 AM Sun

Current conditions

Cloudy
46°
Cloudy
Feels like 45°
High 65°·Low 34° tonight
WindNW 3 mph
Humidity87%
Dew point43°
Pressure30.55 inHg
Visibility10 mi
Cloud cover6%
UV index0 Low
Sunrise7:30 AM
Sunset6:19 PM

Observed at Washington/Dulles International Airport, DC · 1 hr ago

Forecast

10-day

  • Saturday Night

    Patchy fog between 11pm and 1am, then patchy frost and patchy fog. Mostly clear, with a low around 34. East wind around 2 mph.

  • Sunday

    Patchy frost and patchy fog before 9am. Sunny, with a high near 65. North wind around 1 mph.

  • Sunday Night

    Clear, with a low around 36.

National Weather Service forecast updated 1 day ago.

Hourly

Hourly forecast
  1. Now Patchy Frost 36°
  2. 6 AM Patchy Frost 35°
  3. 7 AM Patchy Frost 34°
  4. 8 AM Patchy Frost 36°
  5. 9 AM Sunny 41°
  6. 10 AM Sunny 48°
  7. 11 AM Sunny 55°
  8. 12 PM Sunny 59°
  9. 1 PM Sunny 62°
  10. 2 PM Sunny 63°
  11. 3 PM Sunny 65°
  12. 4 PM Sunny 65°
  13. 5 PM Sunny 63°
  14. 6 PM Clear 60°
  15. 7 PM Clear 54°
  16. 8 PM Clear 50°
  17. 9 PM Clear 46°
  18. 10 PM Clear 45°
  19. 11 PM Mostly Clear 43°
  20. Mon12 AM Mostly Clear 42°
  21. 1 AM Mostly Clear 41°
  22. 2 AM Mostly Clear 40°
  23. 3 AM Mostly Clear 40°
  24. 4 AM Mostly Clear 39°

Daily forecast

Details
  1. FriOct 23 Sunny Sunny36°64°
  2. SatOct 24 Patchy Frost then Sunny Patchy Frost then Sunny34°62°
  3. TodayOct 25 Patchy Frost then Sunny Patchy Frost then Sunny36°65°
  4. MonOct 26 Sunny Sunny46°69°
  5. TueOct 27 Sunny Sunny45°66°
  6. WedOct 28 Partly Sunny Partly Sunny45°63°
  7. ThuOct 29 Mostly Sunny Mostly Sunny46°67°
  8. FriOct 30 Cloudy Cloudy49°75°
  9. SatOct 31 Cloudy Cloudy49°63°

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

Radar

Full map
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Weather news near South Riding

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Air quality

60
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)
Waxing Gibbous · 99% lit
Moonrise 5:39 PM Moonset 6:52 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low63° / 41°
Month to date3.10 in (normal 2.83 in)

Purcellville, records since 1900. 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

A small but persistent area of stratocumulus is lingering near and just west of I-95 in northern Virginia, and may expand a bit through daybreak. Otherwise, the forecast is on track.

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 during the overnight periods with seasonable temperatures during the daylight hours.

After a 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.

High pressure will gradually drift southwest toward the central Appalachians tonight into Monday morning. 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

Some ground fog could develop early this morning near IAD, MRB, and CHO. Otherwise, expect VFR 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 4Search index and reflects what the press published. Terms of use.