Yes

you do need a jacket based on the weather in Seoul, South Korea 1 second ago

Why? Because it's so gusty, you’re basically doing accidental parkour!
73°F23°C & Mostly Cloudy

Wind is 9 mph14 km/h from the Southwest, gusting to 21 mph34 km/h
May 17
12am73°F23°C10 mph16 km/h SouthwestCloudy
1am73°F23°C10 mph17 km/h SouthwestMostly Cloudy
2am71°F22°C12 mph19 km/h SouthwestCloudy
3am69°F20°C10 mph16 km/h SouthwestMostly Cloudy
4am67°F19°C11 mph18 km/h SouthwestCloudy
5am63°F17°C12 mph19 km/h SouthwestRain
6am61°F16°C11 mph17 km/h SouthwestDrizzle
7am60°F15°C8 mph13 km/h SouthwestCloudy
8am59°F15°C6 mph10 km/h SouthwestCloudy
9am58°F15°C7 mph11 km/h WestMostly Cloudy
10am58°F14°C8 mph13 km/h WestMostly Cloudy
11am56°F14°C8 mph13 km/h WestMostly Cloudy
DateLowHighWindDayNight
May 1656°F14°C73°F23°C8 mph13 km/h from SouthwestRainDrizzle
May 1751°F11°C68°F20°C7 mph11 km/h from WestPartly CloudyMostly Clear
May 1851°F11°C71°F22°C10 mph16 km/h from SouthwestMostly CloudyCloudy
May 1960°F15°C78°F26°C7 mph11 km/h from SouthwestPartly CloudyMostly Cloudy
May 2064°F18°C77°F25°C4 mph7 km/h from WestCloudyDrizzle
May 2164°F18°C77°F25°C6 mph10 km/h from NortheastMostly ClearMostly Cloudy
May 2261°F16°C71°F22°C4 mph6 km/h from WestCloudyCloudy

Yes

Low of 51°F11°C, High of 68°F20°C
Wind: 7 mph11 km/h
Precipitation: None

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