5-day weather forecast for West McLean, Virginia
Today
64°
86°
Chance Thunderstorms
Wednesday
67°
84°
Chance Thunderstorms
Thursday
67°
82°
Chance Thunderstorms
Friday
63°
75°
Chance Thunderstorms
Saturday
53°
73°
Partly Sunny
Click on a forecast to see the forecast trend for that day
Weather changeability for Herndon, Virginia
| Temperature | Last Month | Last Year |
|---|---|---|
| Average change in high temperature day-to-day | 6.7° | 5.9° |
| Average change in low temperature day-to-day | 5.2° | 7.4° |
| Precipitation | Last Month | Last Year |
|---|---|---|
| Chance of dry day after a precip day | 75% | 55% |
| Chance of precip day after a dry day | 25% | 29% |
Weather forecast accuracy for Herndon, Virginia
| The Weather Channel | 80.46% |
| Intellicast | 80.46% |
| Weather Underground | 70.95% |
| AccuWeather | 70.65% |
| National Weather Service | 69.75% |
| NWS Digital Forecast | 68.87% |
| CustomWeather | 67.37% |
| World Weather Online | 63.29% |
| Persistence | 38.99% |
| National Weather Service | 72.96% |
| The Weather Channel | 72.48% |
| Intellicast | 72.48% |
| AccuWeather | 69.82% |
| NWS Digital Forecast | 68.98% |
| CustomWeather | 66.55% |
| Persistence | 42.57% |
ForecastAdvisor Fact
ForecastWatch.com is the largest provider of weather forecast accuracy statistics.