Yes

you do need a jacket based on the weather in Detroit, MI 48205, USA 1 second ago

Why? Because it's cool. Pleasantly cool, but cool!
58°F15°C & Cloudy

Wind is 6 mph9 km/h from the Northwest, gusting to 11 mph17 km/h
September 4
11am58°F15°C6 mph10 km/h NorthwestMostly Cloudy
12pm61°F16°C7 mph12 km/h NorthwestMostly Cloudy
1pm64°F18°C7 mph12 km/h WestClear
2pm65°F18°C9 mph14 km/h WestMostly Clear
3pm67°F19°C9 mph15 km/h WestMostly Clear
4pm68°F20°C10 mph16 km/h WestPartly Cloudy
5pm68°F20°C9 mph15 km/h WestMostly Clear
6pm68°F20°C9 mph14 km/h WestMostly Clear
7pm66°F19°C7 mph11 km/h WestPartly Cloudy
8pm64°F18°C6 mph9 km/h SouthwestPartly Cloudy
9pm62°F16°C5 mph9 km/h SouthwestPartly Cloudy
10pm60°F15°C6 mph9 km/h WestMostly Clear
DateLowHighWindDayNight
September 455°F13°C68°F20°C8 mph12 km/h from WestPartly CloudyMostly Clear
September 553°F12°C72°F22°C15 mph25 km/h from SouthwestWindyMostly Cloudy
September 651°F11°C66°F19°C9 mph14 km/h from WestPartly CloudyMostly Clear
September 749°F10°C66°F19°C9 mph14 km/h from WestPartly CloudyMostly Clear
September 846°F8°C68°F20°C4 mph6 km/h from WestMostly ClearMostly Clear
September 949°F10°C71°F22°C6 mph9 km/h from SouthMostly ClearMostly Clear
September 1055°F13°C74°F23°C5 mph8 km/h from SouthwestMostly CloudyPartly Cloudy

Yes

Low of 53°F12°C, High of 73°F23°C
Wind: 15 mph25 km/h
Precipitation: None

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