Yes

you do need a jacket based on the weather in Mackinac Island, MI 49757, USA 1 second ago

Why? Because it's quite chilly.
32°F0°C & Partly Cloudy

Wind is 10 mph16 km/h from the NW, gusting to 16 mph25 km/h
March 28
11pm31°F-0°C11 mph17 km/h NWMostly Cloudy
March 29
12am30°F-1°C10 mph16 km/h NWPartly Cloudy
1am30°F-1°C9 mph14 km/h NWPartly Cloudy
2am30°F-1°C8 mph13 km/h NWMostly Clear
3am30°F-1°C9 mph14 km/h WPartly Cloudy
4am30°F-1°C10 mph16 km/h WPartly Cloudy
5am29°F-2°C11 mph17 km/h WMostly Cloudy
6am29°F-2°C12 mph19 km/h WMostly Cloudy
7am29°F-2°C12 mph19 km/h WMostly Cloudy
8am29°F-1°C12 mph20 km/h WMostly Cloudy
9am30°F-1°C13 mph21 km/h WMostly Cloudy
10am31°F-1°C14 mph22 km/h WMostly Cloudy
DateLowHighWindDayNight
March 2829°F-2°C34°F1°C19 mph30 km/h from WWindyPartly Cloudy
March 2929°F-2°C36°F2°C12 mph20 km/h from WMostly CloudyMostly Clear
March 3028°F-2°C34°F1°C10 mph17 km/h from ESnowMostly Cloudy
March 3129°F-1°C37°F3°C6 mph10 km/h from WMostly CloudyMostly Cloudy
April 131°F-0°C38°F3°C9 mph15 km/h from EMostly CloudyCloudy
April 233°F0°C39°F4°C13 mph20 km/h from NEMostly CloudyMostly Cloudy
April 330°F-1°C40°F4°C18 mph29 km/h from NWindyWindy

Yes

Low of 28°F-2°C, High of 36°F2°C
Wind: 12 mph20 km/h
Precipitation: None

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