No
you don't need a jacket based on the weather in Illinois, USA 1 second ago
72°F22°C & Clear
Wind is 5 mph8 km/h from the Northeast, gusting to 9 mph15 km/h
| September 11 | ||||
| 9pm | 71°F22°C | 5 mph9 km/h Northeast | Clear | |
| 10pm | 68°F20°C | 5 mph9 km/h Northeast | Clear | |
| 11pm | 66°F19°C | 6 mph9 km/h East | Clear | |
| September 12 | ||||
| 12am | 64°F18°C | 7 mph11 km/h East | Clear | |
| 1am | 62°F17°C | 7 mph10 km/h East | Clear | |
| 2am | 61°F16°C | 7 mph11 km/h East | Clear | |
| 3am | 60°F16°C | 7 mph11 km/h East | Mostly Clear | |
| 4am | 60°F15°C | 6 mph10 km/h East | Mostly Clear | |
| 5am | 59°F15°C | 5 mph9 km/h East | Clear | |
| 6am | 58°F15°C | 5 mph8 km/h East | Clear | |
| 7am | 58°F14°C | 5 mph8 km/h East | Clear | |
| 8am | 58°F14°C | 5 mph8 km/h Southeast | Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 11 | 58°F14°C | 84°F29°C | 2 mph3 km/h from Northeast | Clear | Clear |
| September 12 | 57°F14°C | 86°F30°C | 6 mph10 km/h from South | Mostly Clear | Partly Cloudy |
| September 13 | 65°F18°C | 90°F32°C | 8 mph13 km/h from South | Partly Cloudy | Partly Cloudy |
| September 14 | 67°F20°C | 92°F33°C | 4 mph7 km/h from West | Mostly Clear | Partly Cloudy |
| September 15 | 66°F19°C | 89°F32°C | 3 mph4 km/h from Northwest | Mostly Cloudy | Partly Cloudy |
| September 16 | 66°F19°C | 89°F32°C | 4 mph6 km/h from Northeast | Mostly Clear | Partly Cloudy |
| September 17 | 65°F19°C | 87°F31°C | 5 mph8 km/h from East | Mostly Clear | Partly Cloudy |
Yes
Low of 57°F14°C, High of 86°F30°CWind: 6 mph10 km/h
Precipitation: None