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 6.1° 6.5°
Average change in low temperature day-to-day 8.9° 8.1°
Precipitation Last Month Last Year
Chance of dry day after a precip day 44% 55%
Chance of precip day after a dry day 16% 29%

Weather forecast accuracy for Herndon, Virginia

Last Month
The Weather Channel   86.21%
Weather Underground   85.34%
AccuWeather   83.91%
Dark Sky (forecast.io)   80.46%
Foreca   78.45%
MeteoGroup   77.87%
NWS Digital Forecast   76.22%
Persistence   48.72%
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

On average, Dark Sky (forecast.io)'s low temperature forecasts for Herndon were off by 3.25 degrees last month.