Yes

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

Why? Because looks like it's raining!
66°F19°C & Rain

Wind is 2 mph3 km/h from the Southwest, gusting to 8 mph13 km/h
August 31
7pm66°F19°C3 mph6 km/h SouthRain
8pm65°F18°C4 mph6 km/h SouthRain
9pm64°F18°C5 mph7 km/h SouthRain
10pm63°F17°C4 mph7 km/h SouthwestRain
11pm62°F17°C4 mph7 km/h SouthwestRain
September 1
12am62°F16°C5 mph7 km/h SouthwestRain
1am61°F16°C4 mph7 km/h SouthwestRain
2am62°F16°C4 mph7 km/h SouthwestDrizzle
3am62°F17°C4 mph7 km/h SouthDrizzle
4am63°F17°C5 mph8 km/h SouthwestCloudy
5am65°F18°C5 mph7 km/h SouthwestCloudy
6am66°F19°C6 mph9 km/h SouthwestMostly Cloudy
DateLowHighWindDayNight
August 3161°F16°C73°F23°C5 mph9 km/h from SouthwestRainPartly Cloudy
September 157°F14°C71°F22°C6 mph10 km/h from SouthwestPartly CloudyMostly Cloudy
September 259°F15°C73°F23°C10 mph16 km/h from SouthMostly CloudyRain
September 361°F16°C72°F22°C8 mph13 km/h from SouthMostly CloudyMostly Cloudy
September 456°F14°C69°F20°C8 mph13 km/h from WestPartly CloudyMostly Clear
September 552°F11°C72°F22°C5 mph8 km/h from SoutheastPartly CloudyPartly Cloudy
September 659°F15°C79°F26°C7 mph11 km/h from SoutheastPartly CloudyPartly Cloudy

Yes

Low of 57°F14°C, High of 72°F22°C
Wind: 6 mph10 km/h
Precipitation: 18% rain

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