Yes

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

Why? Because it's on the windy side!
80°F27°C & Mostly Clear

Wind is 12 mph20 km/h from the Southwest, gusting to 22 mph36 km/h
July 23
12pm80°F26°C12 mph20 km/h SouthwestMostly Clear
1pm79°F26°C12 mph19 km/h SouthwestMostly Clear
2pm79°F26°C11 mph18 km/h SouthwestClear
3pm79°F26°C10 mph16 km/h SouthwestClear
4pm80°F26°C10 mph15 km/h SouthwestClear
5pm81°F27°C9 mph15 km/h SouthwestClear
6pm82°F28°C9 mph14 km/h SouthwestClear
7pm84°F29°C8 mph14 km/h SouthwestClear
8pm85°F30°C9 mph14 km/h SouthwestClear
9pm87°F31°C9 mph15 km/h SouthClear
10pm88°F31°C11 mph18 km/h SouthClear
11pm89°F32°C13 mph20 km/h SouthClear
DateLowHighWindDayNight
July 2379°F26°C89°F32°C13 mph20 km/h from SouthMostly ClearPartly Cloudy
July 2479°F26°C89°F32°C15 mph24 km/h from SouthMostly ClearMostly Clear
July 2579°F26°C88°F31°C16 mph25 km/h from SouthWindyPartly Cloudy
July 2679°F26°C87°F31°C15 mph24 km/h from SouthMostly CloudyMostly Cloudy
July 2778°F26°C87°F31°C10 mph16 km/h from SouthPartly CloudyMostly Clear
July 2876°F24°C88°F31°C9 mph15 km/h from NortheastMostly ClearMostly Clear
July 2974°F24°C87°F31°C12 mph19 km/h from NortheastMostly ClearPartly Cloudy

No

Low of 80°F27°C, High of 89°F32°C
Wind: 15 mph24 km/h
Precipitation: None

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