Yes

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

Why? Because it's cold enough that makes you wish you had a hat, but you're still too proud to admit it!
48°F9°C & Cloudy

Wind is 2 mph4 km/h from the Southwest, gusting to 6 mph9 km/h
April 27
1pm48°F9°C2 mph4 km/h SouthwestMostly Cloudy
2pm48°F9°C2 mph3 km/h SouthPartly Cloudy
3pm47°F8°C2 mph3 km/h SouthPartly Cloudy
4pm46°F8°C1 mph2 km/h WestClear
5pm45°F7°C2 mph3 km/h WestClear
6pm48°F9°C2 mph3 km/h WestClear
7pm52°F11°C2 mph4 km/h WestClear
8pm56°F14°C4 mph6 km/h WestClear
9pm60°F16°C6 mph10 km/h WestClear
10pm63°F17°C9 mph15 km/h WestClear
11pm65°F18°C11 mph18 km/h WestClear
April 28
12am66°F19°C13 mph21 km/h WestClear
DateLowHighWindDayNight
April 2745°F7°C66°F19°C10 mph15 km/h from WestClearClear
April 2843°F6°C70°F21°C6 mph10 km/h from WestClearMostly Clear
April 2948°F9°C78°F26°C9 mph14 km/h from SouthwestPartly CloudyPartly Cloudy
April 3051°F10°C67°F20°C12 mph20 km/h from SouthRainRain
May 147°F8°C65°F18°C11 mph18 km/h from WestPartly CloudyMostly Cloudy
May 248°F9°C63°F17°C6 mph9 km/h from SouthwestPartly CloudyMostly Clear
May 344°F7°C65°F18°C8 mph13 km/h from WestClearMostly Clear

Yes

Low of 43°F6°C, High of 70°F21°C
Wind: 6 mph10 km/h
Precipitation: None

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