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 9.3° 6.1°
Average change in low temperature day-to-day 12.3° 7.5°
Precipitation Last Month Last Year
Chance of dry day after a precip day 54% 56%
Chance of precip day after a dry day 62% 25%
 
 

Weather forecast accuracy for Herndon, Virginia

Last Month
AccuWeather   74.11%
The Weather Channel   70.54%
Weather Underground   70.54%
World Weather Online   67.26%
MeteoGroup   66.67%
NWS Digital Forecast   66.37%
Foreca   65.18%
Dark Sky (forecast.io)   65.18%
Persistence   30.65%
Last Year
MeteoGroup   75.10%
The Weather Channel   74.72%
Weather Underground   74.67%
Foreca   73.88%
AccuWeather   73.07%
Dark Sky (forecast.io)   72.01%
NWS Digital Forecast   67.01%
World Weather Online   61.88%
Persistence   44.51%
 

ForecastAdvisor Fact

On average, NWS Digital Forecast's low temperature forecasts for Herndon were off by 3.29 degrees last year.