Yes

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

Why? Because it's pretty chilly.
58°F15°C & Rain

Wind is 6 mph10 km/h from the NE, gusting to 12 mph20 km/h
April 24
7am58°F15°C7 mph12 km/h NRain
8am58°F14°C9 mph14 km/h NRain
9am58°F14°C10 mph17 km/h NRain
10am58°F14°C13 mph21 km/h NWRain
11am57°F14°C14 mph22 km/h NWCloudy
12pm57°F14°C12 mph20 km/h NWCloudy
1pm58°F14°C10 mph16 km/h NWMostly Cloudy
2pm58°F15°C7 mph11 km/h NWMostly Cloudy
3pm58°F15°C5 mph9 km/h NWPartly Cloudy
4pm58°F15°C4 mph6 km/h NWPartly Cloudy
5pm59°F15°C3 mph5 km/h WPartly Cloudy
6pm62°F16°C3 mph5 km/h WPartly Cloudy
DateLowHighWindDayNight
April 2357°F14°C61°F16°C7 mph12 km/h from ERainRain
April 2457°F14°C78°F25°C3 mph4 km/h from EMostly ClearMostly Clear
April 2557°F14°C79°F26°C7 mph11 km/h from SMostly CloudyDrizzle
April 2658°F14°C67°F19°C7 mph11 km/h from NRainDrizzle
April 2757°F14°C78°F26°C6 mph10 km/h from SMostly ClearPartly Cloudy
April 2860°F15°C77°F25°C7 mph12 km/h from SMostly CloudyCloudy
April 2960°F16°C73°F23°C5 mph8 km/h from EDrizzlePartly Cloudy

Yes

Low of 57°F14°C, High of 78°F26°C
Wind: 3 mph4 km/h
Precipitation: None

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