No
you don't need a jacket based on the weather in Alton, IL, USA 1 second ago
64°F18°C & Clear
Wind is 5 mph8 km/h from the North, gusting to 11 mph18 km/h
| September 7 | ||||
| 12pm | 66°F19°C | 6 mph10 km/h North | Clear | |
| 1pm | 69°F20°C | 7 mph11 km/h North | Clear | |
| 2pm | 71°F21°C | 7 mph12 km/h North | Clear | |
| 3pm | 72°F22°C | 8 mph13 km/h North | Clear | |
| 4pm | 73°F23°C | 8 mph12 km/h North | Clear | |
| 5pm | 72°F22°C | 7 mph11 km/h North | Clear | |
| 6pm | 71°F22°C | 6 mph10 km/h North | Clear | |
| 7pm | 70°F21°C | 5 mph8 km/h North | Clear | |
| 8pm | 66°F19°C | 3 mph5 km/h North | Clear | |
| 9pm | 62°F17°C | 3 mph5 km/h Northeast | Clear | |
| 10pm | 59°F15°C | 4 mph6 km/h Northeast | Clear | |
| 11pm | 57°F14°C | 4 mph6 km/h Northeast | Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 7 | 48°F9°C | 73°F23°C | 6 mph9 km/h from North | Clear | Clear |
| September 8 | 48°F9°C | 75°F24°C | 5 mph8 km/h from Southeast | Mostly Clear | Partly Cloudy |
| September 9 | 51°F11°C | 78°F26°C | 5 mph8 km/h from Southeast | Partly Cloudy | Mostly Clear |
| September 10 | 57°F14°C | 83°F28°C | 3 mph5 km/h from Southwest | Mostly Clear | Mostly Clear |
| September 11 | 61°F16°C | 86°F30°C | 3 mph4 km/h from Northeast | Clear | Mostly Clear |
| September 12 | 64°F18°C | 87°F31°C | 5 mph8 km/h from Southeast | Mostly Clear | Partly Cloudy |
| September 13 | 66°F19°C | 88°F31°C | 3 mph5 km/h from South | Partly Cloudy | Partly Cloudy |
Yes
Low of 48°F9°C, High of 75°F24°CWind: 5 mph8 km/h
Precipitation: None