Yes

you do need a jacket based on the weather in Iwakuni, Yamaguchi Prefecture, Japan 1 second ago

Why? Because it's not very warm out.
58°F14°C & Clear

Wind is 6 mph9 km/h from the SW, gusting to 12 mph20 km/h
March 29
9am58°F14°C6 mph9 km/h SWMostly Clear
10am57°F14°C6 mph10 km/h SWMostly Clear
11am56°F13°C7 mph11 km/h WMostly Clear
12pm55°F13°C7 mph11 km/h WPartly Cloudy
1pm54°F12°C7 mph11 km/h WMostly Cloudy
2pm53°F12°C7 mph11 km/h SWPartly Cloudy
3pm53°F11°C7 mph11 km/h WMostly Clear
4pm52°F11°C6 mph10 km/h WMostly Clear
5pm51°F11°C5 mph8 km/h WMostly Clear
6pm52°F11°C4 mph6 km/h WMostly Clear
7pm56°F13°C4 mph6 km/h WClear
8pm60°F15°C3 mph5 km/h SWClear
DateLowHighWindDayNight
March 2853°F12°C71°F22°C7 mph12 km/h from SWClearMostly Clear
March 2951°F11°C70°F21°C6 mph9 km/h from SWPartly CloudyPartly Cloudy
March 3052°F11°C72°F22°C5 mph7 km/h from WCloudyPartly Cloudy
March 3147°F9°C73°F23°C2 mph4 km/h from WClearMostly Clear
April 143°F6°C69°F20°C3 mph4 km/h from ECloudyRain
April 251°F11°C59°F15°C4 mph7 km/h from NERainRain
April 352°F11°C66°F19°C5 mph8 km/h from NEMostly CloudyMostly Cloudy

Yes

Low of 52°F11°C, High of 70°F21°C
Wind: 6 mph9 km/h
Precipitation: None

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