Yes
you do need a jacket based on the weather in Washington, IL, USA 1 second ago
Why? Because it's cool. Pleasantly cool, but cool!
56°F14°C & Mostly Clear
Wind is 4 mph6 km/h from the Southeast, gusting to 12 mph19 km/h
| September 10 | ||||
| 5am | 56°F13°C | 4 mph7 km/h Southeast | Mostly Clear | |
| 6am | 55°F13°C | 5 mph7 km/h Southeast | Mostly Clear | |
| 7am | 54°F12°C | 4 mph7 km/h Southeast | Clear | |
| 8am | 54°F12°C | 5 mph7 km/h South | Clear | |
| 9am | 59°F15°C | 4 mph7 km/h Southeast | Clear | |
| 10am | 65°F18°C | 5 mph8 km/h South | Clear | |
| 11am | 71°F22°C | 4 mph7 km/h South | Clear | |
| 12pm | 75°F24°C | 4 mph6 km/h South | Clear | |
| 1pm | 78°F25°C | 3 mph5 km/h South | Clear | |
| 2pm | 80°F27°C | 3 mph5 km/h South | Mostly Clear | |
| 3pm | 81°F27°C | 3 mph5 km/h South | Mostly Clear | |
| 4pm | 82°F28°C | 3 mph5 km/h South | Mostly Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 10 | 54°F12°C | 82°F28°C | 4 mph6 km/h from South | Mostly Clear | Mostly Clear |
| September 11 | 56°F13°C | 83°F28°C | 4 mph6 km/h from Northeast | Clear | Mostly Clear |
| September 12 | 58°F14°C | 87°F30°C | 6 mph10 km/h from South | Mostly Clear | Partly Cloudy |
| September 13 | 66°F19°C | 89°F32°C | 9 mph14 km/h from Southwest | Mostly Cloudy | Partly Cloudy |
| September 14 | 69°F20°C | 92°F33°C | 6 mph9 km/h from West | Mostly Clear | Partly Cloudy |
| September 15 | 67°F20°C | 86°F30°C | 4 mph7 km/h from Southeast | Mostly Cloudy | Partly Cloudy |
| September 16 | 65°F19°C | 84°F29°C | 5 mph8 km/h from Southeast | Partly Cloudy | Mostly Clear |
Yes
Low of 55°F13°C, High of 83°F29°CWind: 4 mph6 km/h
Precipitation: None