Yes

you do need a jacket based on the weather in Milwaukee, WI, USA 1 second ago

Why? Because it's quite chilly.
35°F1°C & Partly Cloudy

Wind is 2 mph4 km/h from the N, gusting to 5 mph8 km/h
March 29
11am37°F3°C3 mph4 km/h NEPartly Cloudy
12pm40°F4°C4 mph7 km/h EPartly Cloudy
1pm42°F6°C6 mph9 km/h EPartly Cloudy
2pm44°F7°C7 mph11 km/h EMostly Cloudy
3pm46°F8°C8 mph13 km/h EPartly Cloudy
4pm46°F8°C9 mph14 km/h SEPartly Cloudy
5pm45°F7°C9 mph15 km/h SEPartly Cloudy
6pm45°F7°C9 mph15 km/h EMostly Cloudy
7pm43°F6°C9 mph14 km/h EMostly Cloudy
8pm41°F5°C8 mph13 km/h EMostly Cloudy
9pm39°F4°C8 mph13 km/h ECloudy
10pm39°F4°C8 mph13 km/h ECloudy
DateLowHighWindDayNight
March 2926°F-3°C46°F8°C6 mph10 km/h from EPartly CloudyRain
March 3037°F3°C49°F9°C9 mph15 km/h from NDrizzleCloudy
March 3137°F3°C44°F7°C8 mph13 km/h from ECloudyRain
April 138°F3°C44°F7°C13 mph21 km/h from NERainDrizzle
April 236°F2°C41°F5°C16 mph25 km/h from NRainSnow
April 334°F1°C40°F4°C19 mph31 km/h from NSnowPartly Cloudy
April 430°F-1°C46°F8°C8 mph13 km/h from NMostly ClearMostly Clear

Yes

Low of 37°F3°C, High of 49°F10°C
Wind: 9 mph15 km/h
Precipitation: 55% rain

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