Yes

you do need a jacket based on the weather in Nanba, Chuo Ward, Osaka, 542-0076, Japan 1 second ago

Why? Because it's not very warm out.
54°F12°C & Mostly Clear

Wind is 8 mph13 km/h from the N, gusting to 13 mph21 km/h
May 8
10am54°F12°C8 mph13 km/h NPartly Cloudy
11am54°F12°C8 mph14 km/h NMostly Cloudy
12pm53°F12°C7 mph12 km/h NMostly Cloudy
1pm53°F12°C7 mph11 km/h NCloudy
2pm53°F12°C7 mph11 km/h NCloudy
3pm53°F11°C7 mph12 km/h NCloudy
4pm52°F11°C7 mph12 km/h NWMostly Cloudy
5pm53°F11°C8 mph12 km/h NWPartly Cloudy
6pm54°F12°C10 mph17 km/h NPartly Cloudy
7pm56°F13°C12 mph20 km/h NPartly Cloudy
8pm58°F14°C12 mph20 km/h NMostly Clear
9pm60°F16°C12 mph20 km/h NMostly Clear
DateLowHighWindDayNight
May 754°F12°C67°F20°C13 mph21 km/h from NMostly CloudyPartly Cloudy
May 852°F11°C68°F20°C12 mph19 km/h from NMostly ClearClear
May 947°F9°C74°F23°C6 mph10 km/h from SWClearClear
May 1054°F12°C79°F26°C9 mph14 km/h from SWMostly ClearPartly Cloudy
May 1162°F16°C78°F25°C8 mph13 km/h from SWCloudyHeavy Rain
May 1261°F16°C72°F22°C7 mph11 km/h from SWHeavy RainDrizzle
May 1358°F14°C69°F20°C8 mph13 km/h from NPartly CloudyMostly Cloudy

Yes

Low of 52°F11°C, High of 68°F20°C
Wind: 12 mph19 km/h
Precipitation: None

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