Yes

you do need a jacket based on the weather in Seoul, South Korea 44 seconds ago

Why? Because it's not very warm out!
59°F15°C & Clear

Wind is 4 mph7 km/h from the West, gusting to 10 mph16 km/h
November 4
7am58°F15°C5 mph7 km/h WestClear
8am56°F13°C4 mph6 km/h NorthwestClear
9am52°F11°C3 mph5 km/h NorthwestClear
10am50°F10°C2 mph4 km/h NorthwestClear
11am48°F9°C2 mph3 km/h NorthwestClear
12pm46°F8°C1 mph2 km/h NorthClear
1pm46°F8°C1 mph2 km/h NorthClear
2pm44°F6°C2 mph3 km/h NortheastClear
3pm42°F6°C2 mph4 km/h NortheastClear
4pm41°F5°C2 mph4 km/h NortheastClear
5pm40°F5°C2 mph4 km/h NortheastClear
6pm40°F4°C2 mph4 km/h NortheastClear
DateLowHighWindDayNight
November 339°F4°C60°F15°C3 mph5 km/h from WestClearClear
November 438°F3°C64°F18°C3 mph4 km/h from NorthMostly ClearMostly Clear
November 541°F5°C65°F18°C3 mph4 km/h from NorthwestPartly CloudyMostly Cloudy
November 646°F8°C65°F18°C3 mph5 km/h from EastMostly CloudyPartly Cloudy
November 749°F9°C63°F17°C5 mph7 km/h from SoutheastMostly CloudyRain
November 845°F7°C62°F16°C8 mph13 km/h from WestPartly CloudyMostly Clear
November 939°F4°C54°F12°C7 mph11 km/h from NorthwestClearMostly Clear

Yes

Low of 37°F3°C, High of 64°F18°C
Wind: 3 mph4 km/h
Precipitation: None

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