Yes

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

Why? Because it's cool. Pleasantly cool, but cool.
52°F11°C & Cloudy

Wind is 8 mph13 km/h from the S, gusting to 18 mph29 km/h
May 1
6am52°F11°C9 mph14 km/h SCloudy
7am54°F12°C10 mph16 km/h SCloudy
8am56°F14°C11 mph18 km/h SCloudy
9am60°F15°C12 mph19 km/h SMostly Cloudy
10am64°F18°C13 mph21 km/h SWPartly Cloudy
11am69°F20°C16 mph25 km/h SWWindy
12pm71°F22°C17 mph27 km/h SWWindy
1pm73°F23°C17 mph27 km/h WWindy
2pm75°F24°C18 mph29 km/h WWindy
3pm74°F23°C18 mph29 km/h WWindy
4pm73°F23°C17 mph28 km/h WWindy
5pm71°F22°C16 mph26 km/h WWindy
DateLowHighWindDayNight
May 147°F9°C75°F24°C15 mph24 km/h from SWWindyMostly Clear
May 247°F8°C74°F23°C6 mph10 km/h from EMostly CloudyMostly Cloudy
May 356°F13°C74°F23°C7 mph12 km/h from SWRainDrizzle
May 454°F12°C73°F23°C5 mph8 km/h from NEPartly CloudyMostly Cloudy
May 553°F11°C73°F23°C6 mph10 km/h from NPartly CloudyPartly Cloudy
May 651°F10°C74°F23°C7 mph11 km/h from SEMostly CloudyPartly Cloudy
May 758°F15°C75°F24°C11 mph17 km/h from SDrizzleDrizzle

Yes

Low of 47°F9°C, High of 73°F23°C
Wind: 6 mph10 km/h
Precipitation: 11% rain

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