5-day weather forecast for Manassas, Virginia

Weather changeability for Herndon, Virginia

Temperature Last Month Last Year
Average change in high temperature day-to-day 6.5° 5.8°
Average change in low temperature day-to-day 5.5° 7.6°
Precipitation Last Month Last Year
Chance of dry day after a precip day 56% 60%
Chance of precip day after a dry day 47% 27%
 
 

Weather forecast accuracy for Herndon, Virginia

Last Month
National Weather Service   73.40%
Weather Underground   71.47%
Dark Sky (forecast.io)   69.55%
The Weather Channel   68.27%
AccuWeather   66.99%
WeatherBug   66.03%
MeteoGroup   64.42%
CustomWeather   63.46%
Foreca   62.88%
Persistence   37.85%
Last Year
MeteoGroup   76.15%
The Weather Channel   75.54%
AccuWeather   72.40%
Foreca   72.25%
National Weather Service   72.09%
Weather Underground   71.69%
WeatherBug   71.23%
CustomWeather   68.49%
Persistence   42.90%
 

ForecastAdvisor Fact

3.7% of National Weather Service's high temperature forecasts for Herndon were off by more than 10 degrees last year.