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 3.0° 5.8°
Average change in low temperature day-to-day 5.2° 7.6°
Precipitation Last Month Last Year
Chance of dry day after a precip day 40% 60%
Chance of precip day after a dry day 23% 27%
 
 

Weather forecast accuracy for Herndon, Virginia

Last Month
MeteoGroup   79.60%
The Weather Channel   77.30%
Weather Underground   75.00%
AccuWeather   72.99%
Dark Sky (forecast.io)   72.41%
CustomWeather   71.30%
WeatherBug   70.98%
National Weather Service   70.69%
Foreca   68.75%
Persistence   57.41%
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

On average, CustomWeather's high temperature forecasts for Herndon were off by 2.27 degrees last month.