Yes

you do need a jacket based on the weather in Japan, 〒740-8555 Yamaguchi, Iwakuni, Misumimachi, 2-chōme, 官有地 1 second ago

Why? Because just cool enough for a jacket, but not warm enough to ditch it!
53°F12°C & Clear

Wind is 8 mph13 km/h from the Northeast, gusting to 17 mph27 km/h
November 7
10pm54°F12°C8 mph14 km/h NortheastClear
11pm56°F13°C9 mph14 km/h NortheastClear
November 8
12am58°F15°C9 mph15 km/h NortheastMostly Clear
1am61°F16°C9 mph14 km/h NortheastMostly Clear
2am63°F17°C8 mph12 km/h NortheastMostly Clear
3am65°F18°C7 mph11 km/h EastMostly Clear
4am66°F19°C6 mph10 km/h EastPartly Cloudy
5am66°F19°C5 mph8 km/h EastMostly Cloudy
6am66°F19°C4 mph6 km/h EastMostly Cloudy
7am65°F18°C4 mph6 km/h EastMostly Cloudy
8am63°F17°C3 mph5 km/h EastCloudy
9am62°F17°C3 mph6 km/h EastMostly Cloudy
DateLowHighWindDayNight
November 753°F12°C66°F19°C6 mph10 km/h from NortheastPartly CloudyRain
November 857°F14°C69°F20°C4 mph7 km/h from WestRainMostly Clear
November 947°F8°C63°F17°C7 mph12 km/h from NorthwestClearClear
November 1043°F6°C62°F17°C3 mph4 km/h from NortheastMostly ClearMostly Clear
November 1148°F9°C62°F17°C7 mph11 km/h from NortheastPartly CloudyCloudy
November 1252°F11°C64°F18°C2 mph4 km/h from NortheastCloudyMostly Cloudy
November 1352°F11°C66°F19°C4 mph6 km/h from NortheastMostly ClearMostly Clear

Yes

Low of 57°F14°C, High of 69°F21°C
Wind: 4 mph7 km/h
Precipitation: 98% rain

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