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Herndon, VA 20172 Weather
Current conditions
Observed at Washington/Dulles International Airport, DC · 58 min ago
Forecast
10-day-
This Afternoon
Sunny, with a high near 69. North wind around 10 mph, with gusts as high as 18 mph.
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Tonight
Clear, with a low around 45. North wind around 8 mph.
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Wednesday
Sunny, with a high near 64. North wind around 8 mph.
National Weather Service forecast updated 8 hrs ago.
Hourly
Hourly forecast- Now68°
- 5 PM65°
- 6 PM65°
- 7 PM62°
- 8 PM59°
- 9 PM57°
- 10 PM55°
- 11 PM54°
- Wed12 AM53°
- 1 AM52°
- 2 AM50°
- 3 AM49°
- 4 AM48°
- 5 AM47°
- 6 AM46°
- 7 AM45°
- 8 AM46°
- 9 AM49°
- 10 AM53°
- 11 AM57°
- 12 PM59°
- 1 PM60°
- 2 PM62°
- 3 PM62°
10-day forecast
Details- TodayOct 20Sunny45°69°
- WedOct 21Sunny42°64°
- ThuOct 22Sunny45°66°
- FriOct 23Sunny39°60°
- SatOct 24Sunny38°60°
- SunOct 25Sunny41°65°
- MonOct 26Mostly Sunny49°69°
- TueOct 27Partly cloudy47°67°
- WedOct 28Cloudy46°62°
- ThuOct 29Cloudy52°68°
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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Air quality
Air quality is satisfactory, and air pollution poses little or no risk.
Forecast
- TueGood (39)
- WedGood (33)
- ThuGood (33)
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
Almanac
MonthlySterling-Dulles Airport Area, records since 1960. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
- Washington 31 km
- Arlington 26 km
- Alexandria 35 km
- Columbia 56 km
- Germantown 25 km
- Silver Spring 31 km
- Centreville 15 km
- Frederick 49 km
- Waldorf 55 km
- Gaithersburg 25 km
- Rockville 24 km
- Dale City 38 km
Forecasters' discussion
From the National Weather Service office in LWX, issued 3 hrs ago
What Has Changed
No significant changes to the forecast.
Key Messages
- 1) Cool and dry weather continues through the weekend, although a slow-moving Nor'easter off the coast will bring gusty winds along the Chesapeake Bay and minor tidal flooding at times through Friday.
Discussion
KEY MESSAGE 1...Cool and dry weather continues through the weekend, although a slow-moving Nor'easter off the coast will bring gusty winds along the Chesapeake Bay and minor tidal flooding at times through Friday.
Surface high pressure remains over the forecast area through the forecast period as a Nor'easter continues to drift offshore. A tight pressure gradient between surface high pressure nearby and the offshore Nor'easter will yield gusty conditions daily, mainly along and east of the I-95 corridor. Under high pressure, temperatures moderate through Thursday with high temperatures in the 50s and 60s. Overnight low temperatures will be in the 30s and 40s through Thursday night. Aloft, upper level troughing develops across the eastern CONUS as ridging develops over central CONUS. By Thursday, the Nor'easter is absorbed into the upper trough and tracks off the coast of New England.
Surface high pressure builds southward out of southeastern Canada and eastern Great Lakes regions into the mid-Atlantic Friday through Monday. Dry conditions are expected each day with a gradual moderating trend in temperatures.
Aviation
VFR conditions continue as surface high pressure builds overhead and dry conditions persist. Winds remain primarily out of the north each day with terminals near the airport gusting around 15 knots in the afternoon. Otherwise, terminals can expect light northerly winds, no precipitation, and VFR conditions.
VFR conditions Friday through Saturday night. Winds generally north 5 to 15 knots.
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.