Yes

you do need a jacket based on the weather in Tokyo, Japan 1 second ago

Why? Because too cold for just a hoodie, too warm for a parka!
50°F10°C & Mostly Clear

Wind is 8 mph13 km/h from the Southwest, gusting to 14 mph23 km/h
December 21
8am48°F9°C7 mph11 km/h SouthwestClear
9am46°F8°C5 mph8 km/h WestClear
10am44°F7°C4 mph6 km/h NorthwestClear
11am42°F6°C4 mph7 km/h NorthwestClear
12pm41°F5°C6 mph10 km/h NorthwestClear
1pm41°F5°C10 mph16 km/h NorthwestClear
2pm40°F5°C10 mph16 km/h NorthwestClear
3pm41°F5°C11 mph17 km/h NorthwestClear
4pm42°F5°C11 mph18 km/h NorthwestClear
5pm42°F6°C11 mph17 km/h NorthwestClear
6pm43°F6°C11 mph17 km/h NorthwestClear
7pm45°F7°C11 mph17 km/h NorthClear
DateLowHighWindDayNight
December 2035°F1°C62°F16°C9 mph14 km/h from SouthwestMostly ClearClear
December 2134°F1°C50°F10°C12 mph20 km/h from NorthwestMostly ClearClear
December 2232°F0°C49°F10°C5 mph8 km/h from NorthwestClearClear
December 2333°F1°C50°F10°C6 mph10 km/h from NorthMostly ClearClear
December 2434°F1°C50°F10°C4 mph6 km/h from NorthPartly CloudyMostly Cloudy
December 2537°F3°C54°F12°C3 mph5 km/h from WestPartly CloudyMostly Clear
December 2635°F2°C49°F9°C5 mph8 km/h from NorthwestMostly ClearMostly Clear

Yes

Low of 35°F2°C, High of 50°F10°C
Wind: 12 mph20 km/h
Precipitation: None

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