Yes

you do need a jacket based on the weather in Chicago, IL 60645, USA 1 second ago

Why? Because it's quite chilly.
49°F9°C & Clear

Wind is 9 mph14 km/h from the W, gusting to 16 mph25 km/h
March 28
7pm49°F9°C9 mph14 km/h WClear
8pm47°F8°C7 mph11 km/h WClear
9pm45°F7°C6 mph9 km/h NWClear
10pm43°F6°C5 mph9 km/h NWMostly Clear
11pm41°F5°C5 mph8 km/h NWMostly Clear
March 29
12am40°F5°C5 mph8 km/h NMostly Clear
1am39°F4°C4 mph7 km/h NClear
2am37°F3°C4 mph7 km/h NClear
3am36°F2°C4 mph7 km/h NClear
4am35°F2°C4 mph7 km/h NClear
5am34°F1°C5 mph8 km/h NClear
6am34°F1°C5 mph7 km/h NMostly Clear
DateLowHighWindDayNight
March 2830°F-1°C50°F10°C7 mph11 km/h from WMostly ClearMostly Clear
March 2934°F1°C49°F10°C7 mph11 km/h from EPartly CloudyRain
March 3043°F6°C58°F14°C9 mph14 km/h from NWMostly CloudyMostly Cloudy
March 3140°F4°C47°F9°C9 mph14 km/h from EDrizzleRain
April 142°F5°C47°F8°C11 mph18 km/h from NERainRain
April 239°F4°C44°F7°C15 mph24 km/h from NDrizzleMostly Cloudy
April 334°F1°C48°F9°C14 mph23 km/h from NPartly CloudyMostly Clear

Yes

Low of 34°F1°C, High of 49°F10°C
Wind: 7 mph11 km/h
Precipitation: None

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