No
you don't need a jacket based on the weather in Illinois, USA 1 second ago
65°F18°C & Clear
Wind is 6 mph10 km/h from the East, gusting to 13 mph21 km/h
| September 15 | ||||
| 9am | 66°F19°C | 7 mph11 km/h East | Clear | |
| 10am | 72°F22°C | 7 mph11 km/h Southeast | Clear | |
| 11am | 77°F25°C | 7 mph12 km/h Southeast | Clear | |
| 12pm | 82°F28°C | 7 mph11 km/h Southeast | Clear | |
| 1pm | 85°F29°C | 8 mph12 km/h Southeast | Clear | |
| 2pm | 86°F30°C | 7 mph11 km/h East | Clear | |
| 3pm | 87°F31°C | 7 mph12 km/h East | Clear | |
| 4pm | 88°F31°C | 6 mph10 km/h East | Clear | |
| 5pm | 88°F31°C | 6 mph10 km/h East | Clear | |
| 6pm | 87°F31°C | 6 mph10 km/h East | Clear | |
| 7pm | 85°F29°C | 6 mph10 km/h East | Clear | |
| 8pm | 80°F27°C | 6 mph9 km/h East | Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 15 | 62°F17°C | 88°F31°C | 7 mph11 km/h from East | Clear | Clear |
| September 16 | 61°F16°C | 87°F31°C | 7 mph11 km/h from East | Clear | Mostly Clear |
| September 17 | 58°F15°C | 86°F30°C | 4 mph6 km/h from East | Mostly Clear | Mostly Clear |
| September 18 | 59°F15°C | 88°F31°C | 6 mph10 km/h from South | Mostly Clear | Partly Cloudy |
| September 19 | 63°F17°C | 83°F28°C | 7 mph11 km/h from South | Partly Cloudy | Partly Cloudy |
| September 20 | 62°F17°C | 82°F28°C | 8 mph13 km/h from South | Partly Cloudy | Rain |
| September 21 | 63°F17°C | 79°F26°C | 10 mph15 km/h from Southwest | Drizzle | Thunderstorms |
No
Low of 61°F16°C, High of 87°F31°CWind: 7 mph11 km/h
Precipitation: None