Yes

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

Why? Because it's not very warm out!
56°F13°C & Clear

Wind is 4 mph7 km/h from the Northwest, gusting to 11 mph17 km/h
August 26
11pm56°F13°C5 mph8 km/h NorthwestClear
August 27
12am54°F12°C5 mph8 km/h NorthwestClear
1am52°F11°C5 mph8 km/h NorthwestClear
2am51°F10°C4 mph7 km/h NorthwestClear
3am49°F9°C4 mph7 km/h NorthwestClear
4am48°F9°C4 mph7 km/h WestClear
5am47°F8°C4 mph7 km/h WestClear
6am46°F8°C4 mph7 km/h WestClear
7am46°F8°C4 mph7 km/h WestClear
8am49°F9°C3 mph6 km/h SouthwestClear
9am55°F13°C4 mph6 km/h SouthwestClear
10am61°F16°C5 mph9 km/h SouthwestClear
DateLowHighWindDayNight
August 2648°F9°C70°F21°C6 mph9 km/h from NorthwestMostly ClearClear
August 2746°F8°C73°F23°C8 mph13 km/h from WestPartly CloudyPartly Cloudy
August 2855°F13°C71°F22°C9 mph15 km/h from WestRainPartly Cloudy
August 2947°F9°C67°F20°C7 mph11 km/h from NorthMostly ClearClear
August 3047°F8°C70°F21°C4 mph7 km/h from NorthwestMostly ClearMostly Clear
August 3149°F10°C75°F24°C3 mph5 km/h from NorthClearMostly Clear
September 153°F11°C76°F24°C4 mph6 km/h from SoutheastMostly ClearClear

Yes

Low of 46°F8°C, High of 73°F23°C
Wind: 8 mph13 km/h
Precipitation: None

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