Yes

you do need a jacket based on the weather in Grand Ledge, MI 48837, USA 1 second ago

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

Wind is 4 mph7 km/h from the NE, gusting to 7 mph12 km/h
May 6
3am51°F11°C5 mph7 km/h ECloudy
4am50°F10°C4 mph7 km/h ECloudy
5am50°F10°C6 mph10 km/h ECloudy
6am49°F9°C7 mph12 km/h ECloudy
7am48°F9°C7 mph12 km/h ECloudy
8am50°F10°C7 mph12 km/h ECloudy
9am52°F11°C9 mph14 km/h ECloudy
10am56°F13°C9 mph14 km/h ECloudy
11am59°F15°C9 mph15 km/h ECloudy
12pm62°F17°C10 mph16 km/h ECloudy
1pm64°F18°C10 mph16 km/h ECloudy
2pm66°F19°C10 mph16 km/h EMostly Cloudy
DateLowHighWindDayNight
May 648°F9°C70°F21°C9 mph15 km/h from EMostly CloudyMostly Clear
May 746°F8°C70°F21°C12 mph20 km/h from SERainRain
May 853°F12°C74°F23°C9 mph14 km/h from WPartly CloudyRain
May 949°F9°C62°F17°C11 mph17 km/h from NERainDrizzle
May 1045°F7°C60°F16°C9 mph15 km/h from NMostly CloudyPartly Cloudy
May 1143°F6°C61°F16°C7 mph11 km/h from WMostly CloudyDrizzle
May 1245°F7°C60°F16°C6 mph10 km/h from NWMostly CloudyPartly Cloudy

Yes

Low of 46°F8°C, High of 70°F21°C
Wind: 12 mph20 km/h
Precipitation: 33% rain

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