Yes

you do need a jacket based on the weather in DeWitt, MI 48820, USA 1 second ago

Why? Because it's not very warm out!
54°F12°C & Clear

Wind is 2 mph3 km/h from the Northeast, gusting to 3 mph5 km/h
August 2
4am54°F12°C2 mph3 km/h NortheastClear
5am53°F11°C2 mph4 km/h NortheastClear
6am52°F11°C2 mph2 km/h NortheastMostly Clear
7am52°F11°C1 mph2 km/h NortheastMostly Clear
8am56°F13°C2 mph3 km/h SouthwestMostly Clear
9am61°F16°C1 mph1 km/h SouthMostly Clear
10am66°F19°C1 mph2 km/h NorthwestMostly Clear
11am71°F22°C2 mph3 km/h NorthwestMostly Clear
12pm73°F23°C3 mph5 km/h NorthMostly Clear
1pm76°F24°C3 mph5 km/h NorthClear
2pm77°F25°C4 mph6 km/h NorthClear
3pm78°F26°C4 mph6 km/h NortheastClear
DateLowHighWindDayNight
August 252°F11°C79°F26°C3 mph4 km/h from NortheastMostly ClearClear
August 357°F14°C82°F28°C3 mph6 km/h from SoutheastClearClear
August 458°F15°C82°F28°C5 mph8 km/h from SoutheastMostly ClearPartly Cloudy
August 561°F16°C84°F29°C7 mph11 km/h from SoutheastPartly CloudyPartly Cloudy
August 663°F17°C85°F30°C7 mph11 km/h from SoutheastMostly ClearPartly Cloudy
August 766°F19°C85°F29°C7 mph12 km/h from SouthPartly CloudyMostly Clear
August 867°F20°C86°F30°C8 mph12 km/h from SouthPartly CloudyMostly Clear

Yes

Low of 57°F14°C, High of 82°F28°C
Wind: 3 mph6 km/h
Precipitation: None

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