5-day weather forecast for Herndon, Virginia

Weather changeability for Herndon, Virginia

Temperature Last Month Last Year
Average change in high temperature day-to-day 6.7° 6.1°
Average change in low temperature day-to-day 7.3° 7.5°
Precipitation Last Month Last Year
Chance of dry day after a precip day 38% 56%
Chance of precip day after a dry day 47% 25%

Weather forecast accuracy for Herndon, Virginia

Last Month
AccuWeather   76.19%
NWS Digital Forecast   75.62%
Dark Sky (forecast.io)   75.60%
MeteoGroup   75.30%
Weather Underground   74.40%
The Weather Channel   73.81%
Foreca   71.43%
World Weather Online   59.20%
Persistence   37.37%
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.