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 6.8° 6.2°
Average change in low temperature day-to-day 6.5° 7.7°
Precipitation Last Month Last Year
Chance of dry day after a precip day 35% 63%
Chance of precip day after a dry day 42% 33%

Weather forecast accuracy for Herndon, Virginia

Last Month
Dark Sky (forecast.io)   70.40%
MeteoGroup   69.83%
Foreca   68.68%
Weather Underground   67.24%
The Weather Channel   66.67%
AccuWeather   65.23%
NWS Digital Forecast   58.91%
World Weather Online   55.46%
Persistence   40.49%
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

6.3% of World Weather Online's low temperature forecasts for Herndon were exactly right last year.