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 5.9° 6.2°
Average change in low temperature day-to-day 8.4° 7.7°
Precipitation Last Month Last Year
Chance of dry day after a precip day 33% 63%
Chance of precip day after a dry day 21% 33%

Weather forecast accuracy for Herndon, Virginia

Last Month
AccuWeather   77.08%
The Weather Channel   77.08%
Weather Underground   77.08%
Dark Sky (forecast.io)   73.51%
NWS Digital Forecast   73.49%
MeteoGroup   71.73%
Foreca   69.35%
World Weather Online   62.18%
Persistence   42.13%
Last Year
AccuWeather   75.78%
The Weather Channel   75.34%
Weather Underground   74.95%
MeteoGroup   73.23%
NWS Digital Forecast   71.27%
Dark Sky (forecast.io)   70.42%
Foreca   70.40%
World Weather Online   62.25%
Persistence   43.98%

ForecastAdvisor Fact

On average, Weather Underground's high temperature forecasts for Herndon were off by 2.65 degrees last year.