Yes

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

Why? Because it's not very warm out!
54°F12°C & Mostly Cloudy

Wind is 3 mph5 km/h from the Northwest, gusting to 8 mph13 km/h
August 25
3pm54°F12°C4 mph6 km/h NorthwestMostly Cloudy
4pm53°F11°C3 mph5 km/h NorthwestCloudy
5pm52°F11°C3 mph5 km/h NorthwestCloudy
6pm51°F11°C4 mph6 km/h NorthwestCloudy
7pm51°F10°C5 mph7 km/h NorthwestCloudy
8pm50°F10°C4 mph7 km/h WestCloudy
9pm49°F10°C4 mph7 km/h NorthwestCloudy
10pm49°F9°C5 mph8 km/h NorthwestMostly Cloudy
11pm48°F9°C5 mph8 km/h NorthwestMostly Cloudy
August 26
12am48°F9°C5 mph8 km/h NorthwestPartly Cloudy
1am49°F9°C5 mph9 km/h NorthwestPartly Cloudy
2am51°F11°C6 mph10 km/h NorthwestMostly Clear
DateLowHighWindDayNight
August 2448°F9°C61°F16°C11 mph18 km/h from NorthPartly CloudyMostly Cloudy
August 2548°F9°C62°F17°C7 mph11 km/h from NorthMostly ClearMostly Clear
August 2645°F7°C65°F18°C5 mph8 km/h from SouthPartly CloudyPartly Cloudy
August 2751°F11°C68°F20°C5 mph7 km/h from SoutheastMostly CloudyRain
August 2857°F14°C64°F18°C8 mph13 km/h from NortheastRainDrizzle
August 2958°F14°C69°F20°C5 mph9 km/h from SouthwestMostly CloudyDrizzle
August 3057°F14°C66°F19°C5 mph9 km/h from SouthDrizzleDrizzle

Yes

Low of 48°F9°C, High of 62°F17°C
Wind: 7 mph11 km/h
Precipitation: 7% rain

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