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 4.4° 6.1°
Average change in low temperature day-to-day 8.3° 7.5°
Precipitation Last Month Last Year
Chance of dry day after a precip day 63% 56%
Chance of precip day after a dry day 22% 25%

Weather forecast accuracy for Herndon, Virginia

Last Month
MeteoGroup   76.61%
Foreca   73.92%
AccuWeather   73.12%
The Weather Channel   72.58%
Weather Underground   72.04%
NWS Digital Forecast   70.43%
Dark Sky (forecast.io)   67.74%
World Weather Online   56.72%
Persistence   44.09%
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

It rained or snowed 59% of the time in Herndon last month when Dark Sky (forecast.io)'s text forecasts called for precipitation, and 7% of the time when they did not.