Yes

you do need a jacket based on the weather in Oslo, Norway 1 second ago

Why? Because you're not freezing, but you’ll definitely start complaining if it lasts much longer!
33°F1°C & Mostly Cloudy

Wind is 2 mph4 km/h from the North, gusting to 3 mph5 km/h
October 31
8am34°F1°C3 mph4 km/h NorthMostly Cloudy
9am36°F2°C2 mph3 km/h NorthMostly Cloudy
10am38°F3°C2 mph3 km/h NortheastMostly Cloudy
11am40°F4°C1 mph2 km/h NortheastCloudy
12pm41°F5°C2 mph3 km/h NortheastCloudy
1pm41°F5°C2 mph3 km/h EastCloudy
2pm41°F5°C1 mph2 km/h EastMostly Cloudy
3pm40°F5°C2 mph3 km/h EastPartly Cloudy
4pm38°F3°C2 mph3 km/h NortheastPartly Cloudy
5pm36°F2°C2 mph3 km/h NortheastMostly Clear
6pm35°F2°C3 mph4 km/h NortheastMostly Clear
7pm34°F1°C3 mph4 km/h NortheastMostly Clear
DateLowHighWindDayNight
October 3032°F-0°C41°F5°C2 mph3 km/h from NortheastMostly CloudyMostly Cloudy
October 3134°F1°C48°F9°C7 mph11 km/h from EastRainRain
November 139°F4°C47°F9°C3 mph5 km/h from SouthDrizzleHaze
November 238°F3°C49°F9°C5 mph8 km/h from SouthCloudyRain
November 348°F9°C53°F12°C10 mph17 km/h from SouthDrizzleDrizzle
November 446°F8°C53°F12°C6 mph10 km/h from SouthDrizzleCloudy
November 544°F7°C49°F10°C4 mph6 km/h from EastDrizzleCloudy

Yes

Low of 34°F1°C, High of 47°F9°C
Wind: 7 mph11 km/h
Precipitation: 92% rain

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