Our Proprietary 10-Day Forecast

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Current warnings over Herndon, Virginia
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<p>Warnings from F5Weather</a></div>

United States weather warnings are issued by various organizations under NOAA. Most from the National Weather Service, but also Storm Prediction Center and National Hurricane Center.

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Current radar over Herndon, Virginia red dot
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<p>Live radar from F5Weather</a></div>

Our radar is based off of US NEXRAD and Canadian weather radar sites through the quality controlled MRMS system. It compiles various sources for radar data and filters out erroneous returns such as sun spikes and ground clutter. We then colorize the precipitation based on our methods for determining precipitation type. Rain is in shades of green, mixed precipitation and freezing rain in shades of pink and snow is in shades of blue.

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Current satellite over Herndon, Virginia red dot
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<p>Live satellite from F5Weather</a></div>

Our satellite is from the GOES-16. It is color enhanced by using a geocolor terrain background during the day and black marble city lights at night. The daytime satellite data is Visible satellite imagery, and nighttime uses Infrared bands. The bluish clouds are fog and low cloud. The whiteest clouds are the coldest, highest cloud tops.

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Current surface weather map around Fairfax County, VA

This surface map is from the HRRR computer model. It is a 1-hour forecast, updated hourly, which is a good estimate of the current surface conditions. This map shows the current high and low pressure centers, pressure isobar contours, wind streamlines and thickness contours. It also shows the currently depicted preciptiation estimates, although this should not be a substitute for actual live radar. The purple dashed contour is the 5400m thickness line, which is often a good proxy for the rain/snow line.

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Temperatures right now near Herndon, Virginia

This is the latest surface temperatures as depicted by the HRRR computer model, updated hourly. Although these are not actual observations, this model is a very good representation of current conditions as it factors in observations, terrain and physics to give you more detailed temperatures in areas that do not have reporting weather stations. For the latest reports at specific locations, like in Herndon, VA please see our current conditions data on the left and right side of this page, or go to our current conditions page.

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Surface wind speed map over Herndon, VA

This map shows the latest HRRR computer model winds. This depiction of the current wind directions and speeds is an estimate from the computer model. For actual observations in Herndon, VA, see the current conditions data on the left and right side of this page, or go to our current conditions page.

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Regional 24 hour rainfall expected near Herndon, Virginia

This is a forecast of the amount of precipitation expected over the next 24 hours from the HRRR weather forecast model. This is only one forecast depiction, and you should check other models to get a better idea of what may happen. You can view this and other models in more detail on our main weather forecast maps page. There, you will also be able to look at forecasts beyond just 24 hours and look at forecasts out to as far as 16 days.

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Area snowfall accumulation expected around Fairfax County, Virginia

This is snowfall forecast, with amounts anticipated in the next 24 hours. This guidance is from the HRRR weather model. For more model forecasts out to 16 days, visit our main weather forecast maps page.

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These are Convective Outlooks from the Storm Prediction Center. Click to see Days 1-3 broken down into Tornado, Wind and Hail threats, as well as days 5-8 outlooks.

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Atlantic Hurricane and Tropical Storm Tracking Map
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<p>Hurricane Tracking from F5Weather</a></div>

Our hurricane tracking map monitors for any current or forecast tropical disturbances in the Atlantic. (See our Pacific Hurricane Tracker) Various hurricane models will draw a 'spaghetti plot' in the Atlantic Basin when a disturbance is forecast or exists, showing the system's forecast track. Once a storm has developed, the National Hurricane Center will forecast their official track. This will show up on the map along with the storm's current intensity, track and name. We will also plot some of the storm's vitals and of course the spaghetti plots from the models along with the NHC forecast track will give you an idea of where it's heading, and its forecast intensity with time.

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To view the latest computer models, visit f5wx.com for access to the weather maps and guidance that meteorologists use to make their forecasts.
 
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  • Canadian GDPS GEM
  • German DWD ICON
  • British MetOffice's UKMET Unified Model
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  • American HRRR
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  • GEFS, GEPS, MOGREPS & European Ensembles
  • Probabilities & Averages
  • 3-Ensemble Mean & more!
View Skew-T soundings, textual data tables for your location, and of course maps! Weather forecast maps of the basics like temperature, wind, pressure, humidity, dew point, cloud cover, simulated radar, travel weather, rainfall and snow are available. More advanced users can also get use out of our severe weather & tornado threat maps, as well as upper air & shear graphics.
 
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Climate Summary
(made with AI, use with caution)
Herndon, VA Climate Summary

Temperature

    •   Average annual temperature: 55.2°F (12.9°C)
    •   Average January temperature: 32.4°F (0.2°C)
    •   Average July temperature: 76.6°F (24.8°C)
    •   Record high temperature: 105°F (40.6°C)
    •   Record low temperature: -15°F (-26.1°C)

Precipitation

    •   Average annual precipitation: 39.45 inches (100.2 cm)
    •   Average snowfall: 19.2 inches (48.8 cm)
    •   Number of days with precipitation: 107

Humidity

    •   Average annual relative humidity: 67%

Wind

    •   Average annual wind speed: 9.2 mph (14.8 km/h)

Climate Type

    •   Humid subtropical climate (Köppen climate classification: Cfa)

Additional Information

    •   Herndon is located in USDA Hardiness Zone 7a.
    •   The growing season in Herndon lasts for an average of 195 days, from April 11 to October 25.
    •   Herndon is home to a variety of trees, including oak, maple, hickory, and pine.
    •   The area is also home to a variety of wildlife, including deer, rabbits, squirrels, and birds.

Overall, Herndon has a mild climate with four distinct seasons. The summers are warm and humid, the winters are cold and snowy, and the spring and fall are mild and pleasant.

Facts & Historical Information
(made with AI, use with caution)
Natural History

    •   Herndon is home to the Frying Pan Farm Park, a 206-acre preserve featuring rolling hills, forests, and a historic farmhouse.

    •   The park is a haven for wildlife, including deer, fox, rabbits, and a variety of bird species.

Science

    •   Herndon is a hub for technology and innovation. It is home to the headquarters of Science Applications International Corporation (SAIC), a major defense contractor.

    •   The town is also home to the National Institute of Standards and Technology (NIST), a federal agency that conducts research in physics, chemistry, and engineering.

Personalities

    •   Herndon was named after Commander William Lewis Herndon, a U.S. Navy officer who died heroically in 1857 while trying to save passengers from a sinking ship.

    •   The town is also associated with George C. Marshall, the U.S. Army general who served as Secretary of State and Secretary of Defense after World War II. Marshall's home, Dodona Manor, is located in Herndon.

Tourist Attractions
1.Steven F. Udvar-Hazy Center

Part of the Smithsonian National Air and Space Museum, this aviation museum showcases over 200 aircraft and spacecraft, including the Space Shuttle Discovery.

2.Reston Town Center

A vibrant mixed-use development featuring shops, restaurants, an ice skating rink, and a movie theater. It also hosts various events and festivals throughout the year.

3.Great Falls Park

Located just a short drive from Herndon, this park offers stunning views of the Potomac River and Great Falls, a series of cascading waterfalls. It's a popular spot for hiking, picnicking, and wildlife viewing.

Nearby Cities:

Oak Grove, VA
Reston, VAFloris, VA
Oak Hill, VADranesville, VA
Sterling, VAWolf Trap, VA
Chantilly, VASugarland Run, VA
Great Falls, VACountryside, VA
Greenbriar, VAOakton, VA
Lowes Island, VASouth Riding, VA
Vienna, VAAshburn, VA
Baltimore, MD
Washington, DCRichmond, VA
Arlington, VAAlexandria, VA
Columbia, MDReading, PA
Germantown, MDWilmington, DE
Silver Spring, MDFrederick, MD
Waldorf, MD