Virginia · NWS LWX office

Herndon, VA weather

It is 48°F and clear at Washington/Dulles International Airport, DC as of Oct 28, 2:15 AM EDT. Overnight: Areas Of Fog, low near 49°F, 1% chance of precipitation. Forecast from the National Weather Service, issued Oct 28, 2:22 AM EDT.

Updated Oct 28, 2:30 AM EDT (snapshot)

Current conditions

Temperature

48°F

Clear

Wind

Calm

Humidity 100% · dew point 48°F

Pressure · visibility

30.39 inHg

Visibility 9 mi

Observed at Washington/Dulles International Airport, DC (KIAD), Oct 28, 2:15 AM EDT. Station readings can lag or be missing.

Alerts for this area

No active NWS alerts cover the Herndon forecast zone right now.

Around the NWS LWX forecast area

No active alerts in zones served by the LWX office near Herndon.

From the alert snapshot of Oct 28, 2026, 2:15 AM EDT. No alerts are active anywhere in Virginia.

For official warnings, check weather.gov and your local authorities. OpenForecast repeats National Weather Service alerts and may be delayed or incomplete. Follow instructions from emergency officials.

Next 24 hours

Hourly forecast for Herndon (local time)
TimeTempForecastPrecip. chanceWind
Wed 2 AM52°FMostly Clear1%E 2 mph
Wed 3 AM51°FAreas Of Fog1%E 2 mph
Wed 4 AM50°FAreas Of Fog1%E 2 mph
Wed 5 AM50°FAreas Of Fog1%E 1 mph
Wed 6 AM50°FAreas Of Fog1%E 1 mph
Wed 7 AM49°FAreas Of Fog1%E 1 mph
Wed 8 AM50°FAreas Of Fog1%E 2 mph
Wed 9 AM52°FAreas Of Fog1%E 2 mph
Wed 10 AM57°FAreas Of Fog1%E 2 mph
Wed 11 AM60°FMostly Cloudy1%SE 3 mph
Wed 12 PM64°FMostly Cloudy1%SE 3 mph
Wed 1 PM66°FPartly Sunny1%SE 5 mph
Wed 2 PM68°FMostly Cloudy1%SE 5 mph
Wed 3 PM68°FCloudy1%SE 5 mph
Wed 4 PM68°FMostly Cloudy1%SE 5 mph
Wed 5 PM68°FMostly Cloudy1%SE 5 mph
Wed 6 PM66°FMostly Cloudy1%SE 3 mph
Wed 7 PM61°FMostly Cloudy1%SE 3 mph
Wed 8 PM57°FMostly Cloudy1%SE 3 mph
Wed 9 PM56°FMostly Cloudy1%SE 3 mph
Wed 10 PM54°FPartly Cloudy1%SE 3 mph
Wed 11 PM53°FPartly Cloudy1%SE 2 mph
Thu 12 AM52°FPatchy Fog1%SE 2 mph
Thu 1 AM50°FPatchy Fog1%S 2 mph

Hourly values come from the NWS gridded forecast for the 2.5 km grid square that covers the city's center point. Conditions elsewhere in Herndon can differ.

7-day forecast

Overnight

Low 49°F

Areas of fog after 3am. Partly cloudy, with a low around 49. East wind around 2 mph.

Wednesday

High 68°F·Low 48°F

Areas of fog before 11am. Mostly cloudy, with a high near 68. Southeast wind 1 to 5 mph.

Wednesday Night: Patchy fog after midnight. Partly cloudy, with a low around 48. Southeast wind 0 to 3 mph.

Thursday

High 72°F·Low 49°F

Patchy fog before 10am. Mostly sunny, with a high near 72. South wind 0 to 6 mph.

Thursday Night: Mostly clear, with a low around 49. Southwest wind around 5 mph.

Friday

High 74°F·Low 46°F

Sunny, with a high near 74.

Friday Night: Mostly clear, with a low around 46.

Saturday

High 65°F·Low 47°F

Partly sunny, with a high near 65.

Saturday Night: Mostly cloudy, with a low around 47.

Sunday

High 68°F·Low 51°F

Mostly cloudy, with a high near 68.

Sunday Night: A chance of rain showers after 1am. Mostly cloudy, with a low around 51. Chance of precipitation is 30%.

Monday

High 67°F·Low 53°F

A chance of rain showers. Mostly cloudy, with a high near 67. Chance of precipitation is 40%.

Monday Night: A chance of rain showers. Mostly cloudy, with a low around 53. Chance of precipitation is 40%.

Tuesday

High 68°F

A chance of rain showers. Partly sunny, with a high near 68.

Nearby cities

Larger cities in the area

See every city we cover in Virginia, or check all active alerts.

About this forecast

Forecast office
Herndon is served by the National Weather Service LWX forecast office, forecast zone VAZ053, county zone VAC059.
Location used
The Census Bureau's internal point for Herndon (38.9704, -77.3871), in Fairfax County. Population: 25,180 (2024 estimate), number 24 of the 28 Virginia cities on this site.
Radar
Nearest NWS radar: KLWX. View it on radar.weather.gov.

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Sources

  • Forecast, hourly forecast, observations and alerts: National Weather Service API, api.weather.gov/points/38.9704,-77.3871 (forecast issued Oct 28, 2:22 AM EDT).
  • Official forecast page: forecast.weather.gov.
  • City location and population: U.S. Census Bureau, Vintage 2024 population estimates and 2024 Gazetteer files.
  • Snapshot taken Oct 28, 2026. The NWS and Census Bureau do not endorse OpenForecast.

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