Yes

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

Why? Because the drizzle is not enough rain to call it "raining," but enough to make you a little soggy and just cool enough for a jacket, but not warm enough to ditch it and it's windy enough to give you a brand new hairdo!
52°F11°C & Drizzle

Wind is 11 mph17 km/h from the Northeast, gusting to 20 mph32 km/h
April 3
3am52°F11°C11 mph18 km/h NortheastRain
4am51°F11°C11 mph18 km/h NortheastRain
5am51°F10°C12 mph19 km/h NortheastCloudy
6am50°F10°C11 mph18 km/h NortheastCloudy
7am49°F10°C10 mph17 km/h NortheastCloudy
8am49°F9°C10 mph16 km/h NortheastCloudy
9am48°F9°C9 mph14 km/h NortheastCloudy
10am48°F9°C7 mph12 km/h NortheastCloudy
11am48°F9°C7 mph11 km/h NortheastCloudy
12pm47°F8°C6 mph10 km/h NorthCloudy
1pm47°F8°C6 mph10 km/h NorthCloudy
2pm47°F8°C6 mph10 km/h NorthMostly Cloudy
DateLowHighWindDayNight
April 248°F9°C52°F11°C12 mph19 km/h from NortheastRainMostly Cloudy
April 346°F8°C56°F13°C6 mph10 km/h from NorthMostly CloudyPartly Cloudy
April 447°F8°C58°F15°C8 mph13 km/h from SouthPartly CloudyMostly Cloudy
April 555°F13°C63°F17°C17 mph27 km/h from SouthwestRainDrizzle
April 654°F12°C63°F17°C8 mph12 km/h from NortheastRainMostly Clear
April 752°F11°C65°F19°C10 mph16 km/h from SouthMostly ClearClear
April 856°F14°C66°F19°C8 mph13 km/h from SouthwestMostly ClearMostly Cloudy

Yes

Low of 46°F8°C, High of 56°F14°C
Wind: 6 mph10 km/h
Precipitation: 25% rain

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