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 8.8° 6.1°
Average change in low temperature day-to-day 9.5° 7.5°
Precipitation Last Month Last Year
Chance of dry day after a precip day 60% 56%
Chance of precip day after a dry day 25% 25%

Weather forecast accuracy for Herndon, Virginia

Last Month
MeteoGroup   80.56%
Foreca   78.45%
Weather Underground   77.87%
The Weather Channel   77.78%
AccuWeather   74.44%
Dark Sky (forecast.io)   73.06%
NWS Digital Forecast   68.33%
World Weather Online   64.08%
Persistence   36.11%
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, MeteoGroup's high temperature forecasts for Herndon were off by 2.10 degrees last month.