Yes

you do need a jacket based on the weather in Svalbard, Svalbard and Jan Mayen 1 second ago

Why? Because it's quite chilly!
34°F1°C & Mostly Clear

Wind is 7 mph11 km/h from the Southeast, gusting to 7 mph12 km/h
September 22
4pm34°F1°C7 mph11 km/h SoutheastMostly Clear
5pm33°F1°C7 mph11 km/h EastMostly Clear
6pm33°F1°C7 mph11 km/h EastMostly Clear
7pm33°F1°C6 mph10 km/h EastMostly Clear
8pm33°F0°C6 mph10 km/h EastMostly Cloudy
9pm33°F0°C6 mph9 km/h EastCloudy
10pm33°F0°C6 mph9 km/h EastCloudy
11pm33°F0°C5 mph9 km/h NortheastCloudy
September 23
12am33°F0°C5 mph8 km/h NortheastCloudy
1am33°F1°C5 mph8 km/h NortheastCloudy
2am33°F1°C5 mph8 km/h NortheastCloudy
3am33°F1°C5 mph8 km/h NortheastCloudy
DateLowHighWindDayNight
September 2131°F-1°C35°F2°C10 mph16 km/h from SouthMostly ClearPartly Cloudy
September 2233°F0°C35°F2°C5 mph8 km/h from NorthCloudyMostly Cloudy
September 2334°F1°C35°F2°C7 mph11 km/h from SouthMostly CloudyMostly Cloudy
September 2432°F0°C34°F1°C6 mph10 km/h from NorthPartly CloudyMostly Cloudy
September 2533°F0°C38°F4°C11 mph18 km/h from SouthDrizzleDrizzle
September 2638°F4°C41°F5°C14 mph22 km/h from SouthRainDrizzle
September 2738°F3°C40°F5°C20 mph32 km/h from SouthwestDrizzleWindy

Yes

Low of 33°F1°C, High of 35°F2°C
Wind: 5 mph8 km/h
Precipitation: None

Support This Page