Yes

you do need a jacket based on the weather in Norrköping, Sweden 1 second ago

Why? Because the drizzle is not enough rain to call it "raining," but enough to make you a little soggy!
63°F17°C & Drizzle

Wind is 6 mph9 km/h from the Southeast, gusting to 14 mph23 km/h
September 2
5pm62°F17°C5 mph8 km/h SoutheastDrizzle
6pm62°F17°C4 mph7 km/h SoutheastDrizzle
7pm61°F16°C4 mph6 km/h SoutheastDrizzle
8pm61°F16°C4 mph7 km/h SouthRain
9pm61°F16°C4 mph7 km/h SouthwestRain
10pm60°F16°C4 mph7 km/h WestRain
11pm59°F15°C5 mph8 km/h WestDrizzle
September 3
12am59°F15°C5 mph8 km/h WestPartly Cloudy
1am60°F15°C6 mph9 km/h WestMostly Cloudy
2am61°F16°C7 mph11 km/h WestPartly Cloudy
3am62°F17°C7 mph12 km/h WestPartly Cloudy
4am64°F18°C8 mph12 km/h WestPartly Cloudy
DateLowHighWindDayNight
September 157°F14°C71°F21°C9 mph14 km/h from SoutheastCloudyRain
September 259°F15°C71°F21°C7 mph11 km/h from SouthwestPartly CloudyPartly Cloudy
September 360°F15°C75°F24°C8 mph13 km/h from SouthPartly CloudyPartly Cloudy
September 458°F14°C72°F22°C5 mph9 km/h from SoutheastRainRain
September 560°F15°C70°F21°C5 mph9 km/h from NorthwestDrizzleDrizzle
September 658°F14°C66°F19°C7 mph11 km/h from WestDrizzleThunderstorms
September 757°F14°C69°F20°C4 mph7 km/h from SouthDrizzleMostly Cloudy

No

Low of 59°F15°C, High of 71°F22°C
Wind: 7 mph11 km/h
Precipitation: 9% rain

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