Yes

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

Why? Because light rain: when the sky can't decide if it’s serious or just messing with you and it's windy enough to give you a brand new hairdo!
80°F27°C & Drizzle

Wind is 11 mph17 km/h from the South, gusting to 19 mph31 km/h
July 1
7am80°F26°C10 mph17 km/h SouthRain
8am79°F26°C10 mph16 km/h SouthRain
9am78°F26°C10 mph16 km/h SouthMostly Cloudy
10am78°F25°C10 mph16 km/h SouthMostly Cloudy
11am77°F25°C10 mph16 km/h SouthMostly Cloudy
12pm77°F25°C10 mph17 km/h SouthMostly Cloudy
1pm77°F25°C10 mph16 km/h SouthMostly Cloudy
2pm77°F25°C10 mph16 km/h SouthMostly Cloudy
3pm77°F25°C9 mph15 km/h SouthMostly Cloudy
4pm77°F25°C9 mph14 km/h SouthCloudy
5pm78°F26°C8 mph13 km/h SouthCloudy
6pm78°F26°C7 mph11 km/h SouthwestCloudy
DateLowHighWindDayNight
June 3077°F25°C85°F30°C12 mph19 km/h from SouthMostly CloudyRain
July 176°F24°C83°F28°C7 mph11 km/h from SouthRainDrizzle
July 275°F24°C84°F29°C9 mph15 km/h from SouthMostly ClearMostly Clear
July 375°F24°C84°F29°C10 mph16 km/h from SouthMostly ClearMostly Cloudy
July 476°F25°C86°F30°C8 mph12 km/h from SouthMostly CloudyMostly Cloudy
July 576°F25°C86°F30°C6 mph10 km/h from SouthMostly CloudyPartly Cloudy
July 677°F25°C85°F30°C8 mph13 km/h from SouthPartly CloudyMostly Clear

No

Low of 76°F25°C, High of 83°F29°C
Wind: 7 mph11 km/h
Precipitation: 54% rain

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