5-day weather forecast for Catlett, Virginia
Today
69°
88°
Partly sunny
Sunday
67°
91°
Partly sunny
Monday
70°
93°
Slight Chance Thunderstorms
Tuesday
72°
90°
Chance Thunderstorms
Wednesday
68°
84°
Slight Chance Thunderstorms
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 | 7.9° | 5.9° |
| Average change in low temperature day-to-day | 8.8° | 7.4° |
| Precipitation | Last Month | Last Year |
|---|---|---|
| Chance of dry day after a precip day | 50% | 55% |
| Chance of precip day after a dry day | 18% | 29% |
Weather forecast accuracy for Herndon, Virginia
| AccuWeather | 67.86% |
| Intellicast | 67.26% |
| The Weather Channel | 66.96% |
| CustomWeather | 64.88% |
| National Weather Service | 63.10% |
| NWS Digital Forecast | 62.35% |
| Weather Underground | 58.93% |
| World Weather Online | 57.14% |
| Persistence | 43.15% |
| 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
13.1% of Weather Underground's high temperature forecasts for Herndon were off by more than 10 degrees last month.