Yes

you do need a jacket based on the weather in Chicago, IL 60659, USA 1 second ago

Why? Because it's quite chilly!
42°F5°C & Clear

Wind is 8 mph13 km/h from the Northwest, gusting to 12 mph20 km/h
March 20
6pm41°F5°C8 mph13 km/h NorthwestClear
7pm40°F5°C7 mph11 km/h NorthwestClear
8pm38°F3°C5 mph8 km/h NorthwestClear
9pm36°F2°C4 mph7 km/h NorthwestClear
10pm35°F2°C4 mph6 km/h NorthwestClear
11pm34°F1°C3 mph5 km/h WestClear
March 21
12am34°F1°C4 mph7 km/h SouthwestMostly Clear
1am33°F1°C5 mph8 km/h SouthwestClear
2am33°F0°C6 mph9 km/h SouthwestClear
3am32°F0°C6 mph10 km/h SouthwestClear
4am32°F-0°C7 mph11 km/h SouthwestClear
5am32°F-0°C8 mph13 km/h SouthwestClear
DateLowHighWindDayNight
March 2031°F-1°C42°F5°C7 mph12 km/h from NorthwestSnowClear
March 2132°F-0°C53°F12°C16 mph27 km/h from SouthwestWindyMostly Cloudy
March 2232°F-0°C44°F6°C8 mph13 km/h from NorthMostly ClearMostly Cloudy
March 2333°F1°C48°F9°C14 mph23 km/h from SouthRainPartly Cloudy
March 2434°F1°C43°F6°C16 mph26 km/h from WestWindyPartly Cloudy
March 2531°F-0°C44°F6°C8 mph12 km/h from WestMostly CloudyMostly Cloudy
March 2633°F0°C43°F6°C9 mph14 km/h from NorthPartly CloudyMostly Clear

Yes

Low of 31°F-1°C, High of 53°F12°C
Wind: 16 mph27 km/h
Precipitation: None

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