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 3.7° 5.8°
Average change in low temperature day-to-day 6.4° 7.6°
Precipitation Last Month Last Year
Chance of dry day after a precip day 56% 60%
Chance of precip day after a dry day 24% 27%

Weather forecast accuracy for Herndon, Virginia

Last Month
MeteoGroup   81.11%
Foreca   76.44%
Dark Sky (forecast.io)   75.56%
The Weather Channel   73.89%
Weather Underground   73.33%
CustomWeather   69.17%
National Weather Service   68.33%
WeatherBug   68.06%
AccuWeather   66.94%
Persistence   44.39%
Last Year
MeteoGroup   76.15%
The Weather Channel   75.54%
AccuWeather   72.40%
Foreca   72.25%
National Weather Service   72.09%
Weather Underground   71.69%
WeatherBug   71.23%
CustomWeather   68.49%
Persistence   42.90%

ForecastAdvisor Fact

It rained or snowed 38% of the time in Herndon last month when National Weather Service's text forecasts called for precipitation, and 21% of the time when they did not.