No
you don't need a jacket based on the weather in Herndon, VA 20170, USA 1 second ago
72°F22°C & Mostly Clear
Wind is 4 mph6 km/h from the Northwest, gusting to 7 mph11 km/h
| September 18 | ||||
| 12pm | 73°F23°C | 4 mph6 km/h Northwest | Partly Cloudy | |
| 1pm | 76°F24°C | 3 mph5 km/h Northwest | Mostly Clear | |
| 2pm | 78°F26°C | 3 mph5 km/h West | Clear | |
| 3pm | 80°F27°C | 4 mph6 km/h West | Clear | |
| 4pm | 81°F27°C | 4 mph6 km/h West | Clear | |
| 5pm | 81°F27°C | 3 mph5 km/h West | Clear | |
| 6pm | 80°F26°C | 2 mph3 km/h Southwest | Clear | |
| 7pm | 76°F24°C | 3 mph5 km/h South | Clear | |
| 8pm | 73°F23°C | 4 mph6 km/h South | Clear | |
| 9pm | 71°F22°C | 5 mph7 km/h South | Clear | |
| 10pm | 69°F21°C | 5 mph9 km/h Southwest | Clear | |
| 11pm | 68°F20°C | 5 mph9 km/h Southwest | Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 18 | 63°F17°C | 81°F27°C | 3 mph5 km/h from West | Mostly Clear | Clear |
| September 19 | 60°F16°C | 84°F29°C | 4 mph6 km/h from Northwest | Clear | Mostly Clear |
| September 20 | 61°F16°C | 78°F25°C | 6 mph10 km/h from East | Mostly Clear | Mostly Cloudy |
| September 21 | 62°F17°C | 76°F24°C | 6 mph9 km/h from Southeast | Mostly Cloudy | Mostly Cloudy |
| September 22 | 64°F18°C | 78°F26°C | 7 mph11 km/h from South | Mostly Cloudy | Mostly Clear |
| September 23 | 64°F18°C | 83°F29°C | 5 mph7 km/h from Southwest | Partly Cloudy | Partly Cloudy |
| September 24 | 65°F18°C | 81°F27°C | 4 mph7 km/h from Northeast | Partly Cloudy | Rain |
No
Low of 60°F16°C, High of 84°F29°CWind: 4 mph6 km/h
Precipitation: None