Yes

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

Why? Because it's cold. simple as that.
41°F5°C & Mostly Clear

Wind is 9 mph15 km/h from the N, gusting to 19 mph31 km/h
April 23
4am42°F6°C10 mph16 km/h NMostly Clear
5am46°F8°C11 mph18 km/h NPartly Cloudy
6am48°F9°C12 mph19 km/h NPartly Cloudy
7am50°F10°C12 mph19 km/h NMostly Cloudy
8am51°F11°C13 mph20 km/h NMostly Cloudy
9am52°F11°C13 mph21 km/h NMostly Cloudy
10am53°F12°C13 mph20 km/h NMostly Cloudy
11am52°F11°C12 mph19 km/h NMostly Cloudy
12pm52°F11°C11 mph17 km/h NMostly Cloudy
1pm50°F10°C9 mph14 km/h NPartly Cloudy
2pm48°F9°C6 mph10 km/h NEPartly Cloudy
3pm44°F7°C4 mph6 km/h NMostly Clear
DateLowHighWindDayNight
April 2233°F1°C53°F12°C11 mph17 km/h from NPartly CloudyPartly Cloudy
April 2333°F1°C50°F10°C6 mph10 km/h from WDrizzleMostly Cloudy
April 2435°F2°C52°F11°C6 mph10 km/h from SWMostly CloudyPartly Cloudy
April 2535°F2°C61°F16°C7 mph11 km/h from SPartly CloudyPartly Cloudy
April 2642°F5°C67°F20°C2 mph3 km/h from NMostly CloudyMostly Cloudy
April 2749°F10°C66°F19°C5 mph8 km/h from SMostly CloudyMostly Cloudy
April 2851°F10°C66°F19°C5 mph8 km/h from NWMostly CloudyCloudy

Yes

Low of 34°F1°C, High of 50°F10°C
Wind: 6 mph10 km/h
Precipitation: 36% rain

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