Yes

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

Why? Because it's cool enough your breath is visible, but your nose isn’t red yet!
46°F8°C & Mostly Clear

Wind is 5 mph8 km/h from the Northwest, gusting to 11 mph18 km/h
May 25
1am45°F7°C5 mph8 km/h NorthwestClear
2am43°F6°C4 mph7 km/h NorthwestMostly Clear
3am41°F5°C4 mph7 km/h NorthwestMostly Clear
4am41°F5°C4 mph6 km/h NorthwestPartly Cloudy
5am40°F5°C4 mph6 km/h NorthMostly Cloudy
6am40°F4°C4 mph6 km/h NorthMostly Cloudy
7am41°F5°C3 mph4 km/h NorthPartly Cloudy
8am45°F7°C3 mph5 km/h NorthMostly Clear
9am50°F10°C4 mph6 km/h NorthMostly Clear
10am54°F12°C5 mph7 km/h NorthClear
11am57°F14°C6 mph10 km/h NorthMostly Clear
12pm59°F15°C7 mph12 km/h NorthwestMostly Clear
DateLowHighWindDayNight
May 2540°F4°C63°F17°C7 mph11 km/h from NorthwestPartly CloudyClear
May 2641°F5°C68°F20°C5 mph9 km/h from NortheastPartly CloudyMostly Cloudy
May 2748°F9°C69°F20°C12 mph19 km/h from EastCloudyRain
May 2853°F11°C63°F17°C10 mph17 km/h from SouthRainDrizzle
May 2952°F11°C65°F18°C14 mph23 km/h from WestCloudyMostly Clear
May 3051°F11°C72°F22°C10 mph16 km/h from WestPartly CloudyDrizzle
May 3151°F10°C68°F20°C8 mph13 km/h from NorthMostly ClearMostly Clear

Yes

Low of 41°F5°C, High of 68°F20°C
Wind: 5 mph9 km/h
Precipitation: None

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