Yes

you do need a jacket based on the weather in Dortmund, Germany 1 second ago

Why? Because it's quite chilly.
47°F8°C & Cloudy

Wind is 14 mph22 km/h from the SW, gusting to 27 mph44 km/h
March 28
7am47°F8°C14 mph22 km/h SWCloudy
8am48°F9°C14 mph23 km/h SWCloudy
9am50°F10°C15 mph24 km/h SWMostly Cloudy
10am51°F11°C15 mph25 km/h SWWindy
11am52°F11°C16 mph25 km/h SWWindy
12pm52°F11°C14 mph22 km/h SWMostly Cloudy
1pm51°F11°C12 mph19 km/h SWCloudy
2pm50°F10°C11 mph18 km/h SWCloudy
3pm49°F10°C12 mph19 km/h SPartly Cloudy
4pm49°F9°C13 mph22 km/h SPartly Cloudy
5pm48°F9°C14 mph23 km/h SWClear
6pm48°F9°C13 mph21 km/h SWMostly Clear
DateLowHighWindDayNight
March 2743°F6°C53°F11°C13 mph21 km/h from SWDrizzleRain
March 2844°F7°C57°F14°C11 mph18 km/h from SDrizzleCloudy
March 2946°F8°C68°F20°C7 mph11 km/h from SMostly CloudyCloudy
March 3044°F7°C62°F17°C5 mph8 km/h from SMostly CloudyMostly Cloudy
March 3148°F9°C55°F13°C10 mph16 km/h from SDrizzleRain
April 145°F7°C50°F10°C15 mph24 km/h from WDrizzleMostly Cloudy
April 244°F7°C55°F13°C9 mph15 km/h from SCloudyMostly Cloudy

Yes

Low of 45°F7°C, High of 56°F14°C
Wind: 11 mph18 km/h
Precipitation: 64% rain

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