Yes

you do need a jacket based on the weather in Seoul, South Korea 53 seconds ago

Why? Because rain: where every drop seems to aim directly at your glasses and it's so windy, you’re practically horizontal just trying to walk!
75°F24°C & Rain

Wind is 12 mph20 km/h from the South, gusting to 30 mph48 km/h
June 19
11pm75°F24°C13 mph21 km/h SouthRain
June 20
12am76°F24°C13 mph21 km/h SouthRain
1am75°F24°C15 mph24 km/h SouthRain
2am75°F24°C15 mph25 km/h SouthRain
3am75°F24°C16 mph26 km/h SouthHeavy Rain
4am74°F23°C16 mph25 km/h SouthHeavy Rain
5am73°F23°C16 mph25 km/h SouthRain
6am73°F23°C15 mph25 km/h SouthwestRain
7am73°F23°C15 mph24 km/h SouthwestRain
8am72°F22°C13 mph22 km/h SouthwestDrizzle
9am71°F22°C13 mph20 km/h SouthwestDrizzle
10am70°F21°C11 mph18 km/h SouthwestDrizzle
DateLowHighWindDayNight
June 1969°F21°C76°F25°C13 mph22 km/h from SouthHeavy RainRain
June 2066°F19°C76°F24°C4 mph7 km/h from WestRainCloudy
June 2164°F18°C80°F27°C5 mph9 km/h from SouthwestPartly CloudyMostly Clear
June 2265°F19°C85°F29°C2 mph4 km/h from NorthwestMostly ClearMostly Cloudy
June 2371°F22°C84°F29°C4 mph6 km/h from WestMostly CloudyRain
June 2467°F19°C83°F28°C4 mph6 km/h from SouthwestDrizzlePartly Cloudy
June 2568°F20°C82°F28°C4 mph7 km/h from WestMostly CloudyDrizzle

No

Low of 66°F19°C, High of 76°F25°C
Wind: 4 mph7 km/h
Precipitation: 48% rain

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