Yes

you do need a jacket based on the weather in Grand Rapids, MI, USA 1 second ago

Why? Because it's cold. simple as that.
49°F9°C & Clear

Wind is 6 mph9 km/h from the E, gusting to 10 mph16 km/h
April 25
10pm46°F8°C6 mph10 km/h EClear
11pm44°F6°C7 mph11 km/h EClear
April 26
12am42°F5°C8 mph12 km/h EClear
1am40°F4°C9 mph14 km/h EClear
2am38°F4°C8 mph12 km/h EClear
3am37°F3°C7 mph11 km/h EClear
4am36°F2°C6 mph10 km/h SEMostly Clear
5am35°F2°C7 mph11 km/h SEMostly Clear
6am35°F2°C8 mph13 km/h EPartly Cloudy
7am35°F1°C9 mph14 km/h EMostly Clear
8am37°F3°C10 mph16 km/h SEMostly Clear
9am42°F5°C11 mph18 km/h SEMostly Clear
DateLowHighWindDayNight
April 2529°F-2°C58°F14°C3 mph5 km/h from EMostly ClearClear
April 2634°F1°C66°F19°C12 mph20 km/h from SEMostly CloudyRain
April 2753°F12°C77°F25°C17 mph28 km/h from SWDrizzleMostly Cloudy
April 2861°F16°C76°F24°C9 mph14 km/h from SWRainRain
April 2962°F17°C74°F23°C13 mph21 km/h from SWDrizzleMostly Cloudy
April 3051°F11°C71°F22°C7 mph11 km/h from WPartly CloudyPartly Cloudy
May 151°F11°C71°F22°C11 mph18 km/h from WMostly ClearMostly Clear

Yes

Low of 35°F2°C, High of 65°F19°C
Wind: 12 mph20 km/h
Precipitation: None

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