Yes

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

Why? Because this drizzle is just a polite way of saying, “Get ready, the big stuff's coming.” and just cool enough for a jacket, but not warm enough to ditch it!
53°F12°C & Drizzle

Wind is 4 mph7 km/h from the Southeast, gusting to 10 mph16 km/h
September 15
11pm53°F12°C5 mph8 km/h SoutheastDrizzle
September 16
12am53°F12°C4 mph7 km/h SoutheastDrizzle
1am53°F12°C4 mph6 km/h SoutheastDrizzle
2am53°F12°C4 mph6 km/h SoutheastDrizzle
3am54°F12°C4 mph6 km/h SoutheastRain
4am54°F12°C3 mph5 km/h SoutheastRain
5am55°F13°C3 mph5 km/h SouthRain
6am56°F13°C2 mph4 km/h SouthDrizzle
7am57°F14°C2 mph3 km/h SouthwestDrizzle
8am57°F14°C2 mph3 km/h SouthwestDrizzle
9am58°F14°C2 mph4 km/h SouthwestDrizzle
10am58°F15°C3 mph5 km/h WestDrizzle
DateLowHighWindDayNight
September 1551°F11°C59°F15°C3 mph5 km/h from SouthRainDrizzle
September 1649°F9°C64°F18°C3 mph6 km/h from WestMostly ClearPartly Cloudy
September 1751°F10°C63°F17°C5 mph9 km/h from SouthwestDrizzleMostly Cloudy
September 1852°F11°C64°F18°C7 mph12 km/h from SouthwestDrizzlePartly Cloudy
September 1950°F10°C62°F17°C6 mph10 km/h from SouthPartly CloudyDrizzle
September 2046°F8°C57°F14°C6 mph9 km/h from NorthwestMostly CloudyMostly Clear
September 2142°F5°C57°F14°C5 mph8 km/h from NorthDrizzleRain

Yes

Low of 49°F10°C, High of 64°F18°C
Wind: 3 mph6 km/h
Precipitation: None

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