Yes

you do need a jacket based on the weather in Chicago, IL, USA 22 minutes ago

Why? Because it's cool. Pleasantly cool, but cool!
53°F12°C & Clear

Wind is 6 mph10 km/h from the Southeast, gusting to 13 mph21 km/h
April 27
2pm56°F13°C7 mph11 km/h EastClear
3pm58°F15°C8 mph12 km/h EastClear
4pm60°F15°C8 mph14 km/h EastMostly Clear
5pm60°F16°C9 mph14 km/h EastClear
6pm60°F16°C9 mph14 km/h EastClear
7pm63°F17°C8 mph13 km/h SoutheastClear
8pm60°F16°C7 mph11 km/h SoutheastClear
9pm58°F15°C6 mph10 km/h SoutheastClear
10pm58°F14°C7 mph11 km/h SoutheastClear
11pm57°F14°C8 mph12 km/h SoutheastClear
April 28
12am56°F13°C7 mph12 km/h SoutheastClear
1am55°F13°C7 mph12 km/h SouthClear
DateLowHighWindDayNight
April 2742°F6°C63°F17°C7 mph10 km/h from EastMostly ClearMostly Clear
April 2851°F11°C79°F26°C13 mph20 km/h from SouthPartly CloudyRain
April 2949°F9°C73°F23°C14 mph22 km/h from WestMostly CloudyMostly Cloudy
April 3046°F8°C59°F15°C8 mph13 km/h from NortheastRainRain
May 150°F10°C69°F20°C7 mph11 km/h from NorthwestRainRain
May 246°F8°C58°F14°C8 mph12 km/h from NorthwestMostly CloudyPartly Cloudy
May 343°F6°C59°F15°C7 mph12 km/h from NorthPartly CloudyMostly Clear

Yes

Low of 51°F11°C, High of 79°F26°C
Wind: 13 mph20 km/h
Precipitation: None

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