5-day weather forecast for Manassas, Virginia

Weather changeability for Herndon, Virginia

Unfortunately, there was not enough data for this station to provide meaningful weather changeability data.

Weather forecast accuracy for Herndon, Virginia

Last Month
Foreca   84.52%
The Weather Channel   84.23%
Weather Underground   84.23%
Dark Sky (forecast.io)   82.21%
MeteoGroup   80.36%
AccuWeather   80.06%
NWS Digital Forecast   75.00%
World Weather Online   69.75%
Persistence   56.94%
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

11.5% of Dark Sky (forecast.io)'s high temperature forecasts for Herndon were exactly right last year.