Yes

you do need a jacket based on the weather in Collinsville, IL, USA 12 minutes ago

Why? Because it's not very warm out!
56°F13°C & Mostly Clear

Wind is 2 mph4 km/h from the Southeast, gusting to 4 mph7 km/h
October 11
8am56°F13°C3 mph4 km/h SoutheastMostly Clear
9am58°F14°C2 mph4 km/h EastPartly Cloudy
10am62°F17°C1 mph2 km/h EastPartly Cloudy
11am66°F19°C3 mph5 km/h EastPartly Cloudy
12pm70°F21°C6 mph9 km/h EastMostly Clear
1pm73°F23°C5 mph9 km/h EastMostly Clear
2pm75°F24°C4 mph7 km/h EastPartly Cloudy
3pm76°F24°C3 mph5 km/h EastPartly Cloudy
4pm77°F25°C3 mph4 km/h EastPartly Cloudy
5pm76°F25°C3 mph4 km/h EastPartly Cloudy
6pm75°F24°C3 mph5 km/h EastPartly Cloudy
7pm73°F23°C3 mph5 km/h EastPartly Cloudy
DateLowHighWindDayNight
October 1156°F13°C77°F25°C3 mph5 km/h from EastPartly CloudyClear
October 1252°F11°C78°F25°C7 mph11 km/h from SoutheastClearMostly Clear
October 1355°F13°C79°F26°C4 mph6 km/h from SouthPartly CloudyPartly Cloudy
October 1459°F15°C81°F27°C3 mph5 km/h from NortheastPartly CloudyPartly Cloudy
October 1561°F16°C76°F25°C5 mph8 km/h from NortheastPartly CloudyPartly Cloudy
October 1656°F14°C78°F25°C6 mph10 km/h from SoutheastClearPartly Cloudy
October 1760°F15°C79°F26°C11 mph17 km/h from SouthPartly CloudyPartly Cloudy

Yes

Low of 53°F12°C, High of 78°F26°C
Wind: 7 mph11 km/h
Precipitation: None

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