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 4.5° 6.5°
Average change in low temperature day-to-day 4.0° 8.1°
Precipitation Last Month Last Year
Chance of dry day after a precip day 67% 55%
Chance of precip day after a dry day 67% 29%
 
 

Weather forecast accuracy for Herndon, Virginia

Last Month
AccuWeather   73.31%
Dark Sky (forecast.io)   71.67%
NWS Digital Forecast   70.33%
MeteoGroup   67.00%
Weather Underground   65.67%
Foreca   64.21%
The Weather Channel   63.67%
Persistence   43.55%
Last Year
MeteoGroup   73.65%
Weather Underground   73.48%
The Weather Channel   73.30%
AccuWeather   71.69%
Foreca   71.26%
WeatherBug   70.41%
NWS Digital Forecast   70.03%
CustomWeather   68.27%
Persistence   41.15%
 

ForecastAdvisor Fact

67.4% of NWS Digital Forecast's high temperature forecasts for Herndon were within 3 degrees of actual temperatures last year.