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 4.1° 5.8°
Average change in low temperature day-to-day 7.4° 7.6°
Precipitation Last Month Last Year
Chance of dry day after a precip day 60% 60%
Chance of precip day after a dry day 29% 27%
 
 

Weather forecast accuracy for Herndon, Virginia

Last Month
WeatherBug   81.39%
AccuWeather   78.76%
MeteoGroup   78.76%
The Weather Channel   77.69%
National Weather Service   77.69%
Weather Underground   76.08%
Dark Sky (forecast.io)   76.08%
CustomWeather   74.19%
Foreca   68.01%
Persistence   43.28%
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

62.4% of Foreca's low temperature forecasts for Herndon were within 3 degrees of actual temperatures last month.