5-day weather forecast for West McLean, Virginia
Today
60°
64°
Chance Rain
Showers
Showers
Saturday
44°
68°
Partly Sunny
Sunday
43°
71°
Mostly Sunny
Monday
48°
75°
Mostly Sunny
Tuesday
51°
79°
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 | 6.8° | 5.9° |
| Average change in low temperature day-to-day | 8.9° | 7.4° |
| Precipitation | Last Month | Last Year |
|---|---|---|
| Chance of dry day after a precip day | 43% | 55% |
| Chance of precip day after a dry day | 16% | 29% |
Weather forecast accuracy for Herndon, Virginia
| The Weather Channel | 72.02% |
| Intellicast | 72.02% |
| Weather Underground | 72.02% |
| National Weather Service | 70.24% |
| NWS Digital Forecast | 70.24% |
| AccuWeather | 69.05% |
| CustomWeather | 66.96% |
| World Weather Online | 60.80% |
| Persistence | 40.71% |
| 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
31.0% of Persistence's high temperature forecasts for Herndon were off by more than 10 degrees last year.