Yes

you do need a jacket based on the weather in Alton, IL, USA 1 second ago

Why? Because sorry, it's too cool for just a hoodie!
50°F10°C & Cloudy

Wind is 8 mph13 km/h from the West, gusting to 16 mph25 km/h
November 1
5pm50°F10°C8 mph14 km/h WestCloudy
6pm51°F10°C10 mph16 km/h WestCloudy
7pm51°F10°C10 mph16 km/h WestCloudy
8pm50°F10°C10 mph15 km/h WestCloudy
9pm49°F9°C9 mph14 km/h NorthwestCloudy
10pm48°F9°C8 mph13 km/h NorthwestCloudy
11pm46°F8°C7 mph11 km/h NorthwestCloudy
November 2
12am44°F7°C4 mph6 km/h NorthwestMostly Cloudy
1am43°F6°C4 mph6 km/h NorthwestPartly Cloudy
2am42°F5°C4 mph6 km/h NorthwestPartly Cloudy
3am41°F5°C4 mph6 km/h NorthwestMostly Clear
4am40°F4°C4 mph6 km/h NorthwestMostly Clear
DateLowHighWindDayNight
November 139°F4°C51°F10°C7 mph11 km/h from WestMostly CloudyMostly Clear
November 234°F1°C54°F12°C3 mph5 km/h from SouthwestMostly ClearMostly Clear
November 337°F3°C62°F17°C5 mph9 km/h from WestClearMostly Cloudy
November 442°F5°C68°F20°C11 mph17 km/h from SouthPartly CloudyPartly Cloudy
November 548°F9°C66°F19°C8 mph14 km/h from NorthwestMostly ClearMostly Clear
November 644°F6°C67°F19°C11 mph18 km/h from SoutheastPartly CloudyMostly Cloudy
November 751°F11°C68°F20°C10 mph16 km/h from WestMostly ClearMostly Clear

Yes

Low of 35°F2°C, High of 54°F12°C
Wind: 3 mph5 km/h
Precipitation: None

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