Yes

you do need a jacket based on the weather in Ypsilanti, MI 48197, USA 1 second ago

Why? Because just cool enough for a jacket, but not warm enough to ditch it!
54°F12°C & Mostly Clear

Wind is 6 mph10 km/h from the Southwest, gusting to 15 mph24 km/h
August 28
4am54°F12°C7 mph11 km/h SouthwestMostly Clear
5am54°F12°C7 mph11 km/h SouthwestMostly Clear
6am54°F12°C6 mph10 km/h SouthwestPartly Cloudy
7am54°F12°C7 mph11 km/h SouthwestMostly Cloudy
8am56°F14°C7 mph11 km/h SouthwestCloudy
9am59°F15°C6 mph10 km/h SouthwestCloudy
10am63°F17°C8 mph14 km/h SouthwestCloudy
11am65°F18°C9 mph15 km/h WestCloudy
12pm66°F19°C9 mph15 km/h WestCloudy
1pm69°F20°C9 mph15 km/h WestMostly Cloudy
2pm70°F21°C9 mph15 km/h WestCloudy
3pm71°F22°C10 mph16 km/h WestRain
DateLowHighWindDayNight
August 2854°F12°C71°F22°C8 mph14 km/h from WestRainMostly Clear
August 2949°F9°C68°F20°C6 mph10 km/h from NorthPartly CloudyClear
August 3047°F8°C72°F22°C3 mph4 km/h from NorthMostly ClearMostly Clear
August 3149°F10°C76°F24°C3 mph5 km/h from EastClearClear
September 152°F11°C77°F25°C5 mph9 km/h from EastMostly ClearMostly Clear
September 255°F13°C77°F25°C5 mph8 km/h from SoutheastMostly ClearMostly Clear
September 358°F14°C77°F25°C6 mph10 km/h from SouthPartly CloudyMostly Cloudy

Yes

Low of 49°F10°C, High of 68°F20°C
Wind: 6 mph10 km/h
Precipitation: None

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