Yes

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

Why? Because it's fairly windy outside!
69°F21°C & Cloudy

Wind is 8 mph13 km/h from the Southwest, gusting to 19 mph31 km/h
June 6
1pm69°F20°C8 mph13 km/h SouthwestMostly Cloudy
2pm68°F20°C7 mph12 km/h SouthwestMostly Cloudy
3pm66°F19°C6 mph10 km/h SouthwestPartly Cloudy
4pm64°F18°C6 mph10 km/h SouthPartly Cloudy
5pm63°F17°C6 mph10 km/h SouthMostly Clear
6pm62°F17°C6 mph10 km/h SouthMostly Clear
7pm61°F16°C6 mph10 km/h SouthPartly Cloudy
8pm60°F16°C6 mph10 km/h SouthPartly Cloudy
9pm60°F15°C6 mph9 km/h SouthMostly Cloudy
10pm59°F15°C6 mph9 km/h SouthMostly Cloudy
11pm59°F15°C6 mph9 km/h SouthDrizzle
June 7
12am58°F15°C6 mph9 km/h SouthCloudy
DateLowHighWindDayNight
June 560°F16°C70°F21°C9 mph15 km/h from SouthwestDrizzleMostly Cloudy
June 658°F15°C70°F21°C11 mph18 km/h from SouthwestDrizzleDrizzle
June 754°F12°C66°F19°C12 mph19 km/h from WestRainMostly Clear
June 849°F9°C71°F21°C4 mph7 km/h from WestPartly CloudyMostly Clear
June 952°F11°C76°F24°C3 mph5 km/h from WestMostly ClearMostly Clear
June 1056°F14°C82°F28°C3 mph5 km/h from NorthMostly ClearMostly Clear
June 1161°F16°C86°F30°C5 mph8 km/h from EastMostly ClearMostly Clear

Yes

Low of 58°F15°C, High of 71°F22°C
Wind: 11 mph18 km/h
Precipitation: 44% rain

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