No
you don't need a jacket based on the weather in Collinsville, IL, USA 1 second ago
80°F26°C & Mostly Cloudy
Wind is 4 mph6 km/h from the East, gusting to 9 mph15 km/h
| September 18 | ||||
| 10pm | 78°F25°C | 4 mph7 km/h East | Mostly Cloudy | |
| 11pm | 76°F24°C | 5 mph8 km/h Southeast | Mostly Cloudy | |
| September 19 | ||||
| 12am | 74°F24°C | 5 mph8 km/h Southeast | Cloudy | |
| 1am | 72°F22°C | 9 mph15 km/h Northwest | Cloudy | |
| 2am | 70°F21°C | 8 mph13 km/h Northwest | Cloudy | |
| 3am | 69°F21°C | 7 mph11 km/h Northwest | Cloudy | |
| 4am | 69°F20°C | 6 mph10 km/h Northwest | Cloudy | |
| 5am | 68°F20°C | 4 mph7 km/h Northwest | Mostly Cloudy | |
| 6am | 67°F19°C | 4 mph6 km/h North | Cloudy | |
| 7am | 66°F19°C | 4 mph7 km/h Northeast | Cloudy | |
| 8am | 67°F19°C | 5 mph8 km/h Northeast | Cloudy | |
| 9am | 68°F20°C | 4 mph7 km/h North | Cloudy | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 18 | 61°F16°C | 94°F35°C | 2 mph4 km/h from Southeast | Mostly Clear | Mostly Cloudy |
| September 19 | 66°F19°C | 83°F28°C | 4 mph6 km/h from West | Mostly Cloudy | Partly Cloudy |
| September 20 | 64°F18°C | 84°F29°C | 5 mph7 km/h from South | Partly Cloudy | Rain |
| September 21 | 67°F19°C | 82°F28°C | 6 mph9 km/h from Southwest | Mostly Cloudy | Thunderstorms |
| September 22 | 66°F19°C | 80°F27°C | 7 mph11 km/h from Southwest | Drizzle | Thunderstorms |
| September 23 | 66°F19°C | 79°F26°C | 5 mph8 km/h from Southwest | Drizzle | Thunderstorms |
| September 24 | 66°F19°C | 75°F24°C | 9 mph15 km/h from Southeast | Rain | Rain |
No
Low of 66°F19°C, High of 83°F29°CWind: 4 mph6 km/h
Precipitation: 51% rain