Yes

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

Why? Because it's cold. simple as that.
48°F9°C & Cloudy

Wind is 14 mph23 km/h from the SE, gusting to 27 mph44 km/h
April 26
12pm50°F10°C15 mph23 km/h SECloudy
1pm52°F11°C14 mph23 km/h SECloudy
2pm55°F13°C15 mph23 km/h SECloudy
3pm56°F14°C14 mph22 km/h SECloudy
4pm56°F13°C13 mph21 km/h SECloudy
5pm55°F13°C13 mph21 km/h SERain
6pm53°F12°C13 mph21 km/h SERain
7pm52°F11°C14 mph23 km/h SERain
8pm51°F11°C15 mph24 km/h SERain
9pm51°F10°C15 mph24 km/h SERain
10pm51°F11°C15 mph24 km/h SEDrizzle
11pm52°F11°C15 mph25 km/h SERain
DateLowHighWindDayNight
April 2641°F5°C56°F14°C14 mph22 km/h from SERainRain
April 2755°F13°C76°F25°C18 mph29 km/h from SWWindyRain
April 2859°F15°C73°F23°C11 mph18 km/h from SRainRain
April 2955°F13°C72°F22°C14 mph22 km/h from SWCloudyPartly Cloudy
April 3049°F9°C74°F23°C7 mph11 km/h from SWMostly ClearRain
May 156°F13°C68°F20°C9 mph14 km/h from NMostly CloudyMostly Cloudy
May 251°F10°C66°F19°C7 mph11 km/h from NERainMostly Cloudy

Yes

Low of 55°F13°C, High of 76°F25°C
Wind: 18 mph29 km/h
Precipitation: 24% rain

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