Yes

you do need a jacket based on the weather in Seoul, South Korea 23 minutes ago

Why? Because it's quite chilly.
47°F9°C & Windy

Wind is 16 mph26 km/h from the W, gusting to 35 mph57 km/h
March 19
5am46°F8°C16 mph25 km/h WWindy
6am44°F7°C15 mph24 km/h WWindy
7am42°F5°C14 mph23 km/h NWMostly Clear
8am41°F5°C14 mph23 km/h NWMostly Clear
9am39°F4°C14 mph22 km/h NWMostly Clear
10am38°F3°C13 mph20 km/h NWClear
11am37°F3°C12 mph19 km/h NWClear
12pm36°F2°C12 mph19 km/h NWClear
1pm35°F2°C11 mph18 km/h NWClear
2pm34°F1°C10 mph17 km/h NWClear
3pm34°F1°C10 mph15 km/h NWClear
4pm34°F1°C9 mph14 km/h NWClear
DateLowHighWindDayNight
March 1837°F3°C51°F10°C13 mph21 km/h from SWDrizzleClear
March 1933°F1°C48°F9°C11 mph18 km/h from NWMostly ClearClear
March 2030°F-1°C51°F11°C5 mph9 km/h from WClearPartly Cloudy
March 2134°F1°C60°F16°C9 mph15 km/h from SERainRain
March 2247°F8°C64°F18°C3 mph5 km/h from WMostly CloudyMostly Cloudy
March 2344°F7°C70°F21°C5 mph8 km/h from NEMostly ClearMostly Cloudy
March 2446°F8°C61°F16°C7 mph11 km/h from ECloudyRain

Yes

Low of 33°F1°C, High of 48°F9°C
Wind: 11 mph18 km/h
Precipitation: None

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