Yes

you do need a jacket based on the weather in Jeju-do, South Korea 11 minutes ago

Why? Because it's cold enough that makes you wish you had a hat, but you're still too proud to admit it and it's really really huffing out there!
45°F7°C & Windy

Wind is 19 mph31 km/h from the Northwest, gusting to 40 mph65 km/h
November 26
12am44°F7°C19 mph31 km/h NorthwestWindy
1am43°F6°C18 mph29 km/h NorthwestWindy
2am42°F6°C16 mph27 km/h NorthwestWindy
3am41°F5°C15 mph24 km/h NorthwestMostly Cloudy
4am41°F5°C14 mph22 km/h NorthwestMostly Cloudy
5am40°F4°C14 mph22 km/h NorthwestMostly Cloudy
6am39°F4°C13 mph20 km/h NorthwestMostly Cloudy
7am39°F4°C12 mph19 km/h WestCloudy
8am39°F4°C12 mph19 km/h WestCloudy
9am40°F5°C12 mph19 km/h WestCloudy
10am41°F5°C12 mph20 km/h WestCloudy
11am41°F5°C12 mph20 km/h WestCloudy
DateLowHighWindDayNight
November 2539°F4°C56°F14°C17 mph28 km/h from NorthwestRainCloudy
November 2634°F1°C41°F5°C19 mph30 km/h from WestDrizzleMostly Cloudy
November 2735°F2°C42°F6°C16 mph26 km/h from WestDrizzleDrizzle
November 2836°F2°C43°F6°C16 mph26 km/h from NorthwestWindyMostly Cloudy
November 2941°F5°C48°F9°C9 mph15 km/h from NorthwestMostly CloudyMostly Cloudy
November 3040°F4°C50°F10°C6 mph10 km/h from NorthwestMostly CloudyMostly Clear
December 143°F6°C54°F12°C8 mph12 km/h from WestMostly ClearPartly Cloudy

Yes

Low of 34°F1°C, High of 41°F5°C
Wind: 19 mph30 km/h
Precipitation: 38% rain

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