Yes

you do need a jacket based on the weather in Osan-si, Gyeonggi-do, South Korea 1 second ago

Why? Because the rain is just enough to ruin your hairstyle but not your mood and it's not very warm out and it's super windy outside!
58°F14°C & Rain

Wind is 13 mph21 km/h from the East, gusting to 31 mph50 km/h
May 9
1am59°F15°C14 mph22 km/h EastRain
2am59°F15°C13 mph21 km/h EastRain
3am60°F16°C13 mph20 km/h EastRain
4am61°F16°C12 mph19 km/h EastRain
5am61°F16°C11 mph17 km/h EastRain
6am61°F16°C9 mph15 km/h SoutheastDrizzle
7am62°F17°C9 mph15 km/h SoutheastDrizzle
8am62°F16°C8 mph13 km/h SoutheastRain
9am61°F16°C8 mph12 km/h SoutheastDrizzle
10am61°F16°C9 mph14 km/h SouthDrizzle
11am60°F16°C9 mph15 km/h SouthDrizzle
12pm58°F14°C9 mph15 km/h SouthDrizzle
DateLowHighWindDayNight
May 856°F14°C62°F17°C11 mph17 km/h from EastRainRain
May 951°F11°C60°F16°C14 mph23 km/h from WestDrizzleMostly Cloudy
May 1049°F9°C68°F20°C6 mph10 km/h from WestPartly CloudyMostly Clear
May 1146°F8°C74°F23°C7 mph11 km/h from SouthwestClearMostly Clear
May 1251°F11°C78°F26°C8 mph12 km/h from SouthwestMostly CloudyMostly Cloudy
May 1354°F12°C76°F24°C7 mph10 km/h from SouthwestMostly CloudyCloudy
May 1460°F15°C74°F23°C9 mph14 km/h from SouthwestRainMostly Cloudy

Yes

Low of 52°F11°C, High of 60°F16°C
Wind: 14 mph23 km/h
Precipitation: 66% rain

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