Yes

you do need a jacket based on the weather in St Helier, Jersey 1 second ago

Why? Because it's so windy, your hat has officially retired from your head!
60°F16°C & Windy

Wind is 17 mph27 km/h from the Northeast, gusting to 22 mph36 km/h
May 9
11am60°F16°C17 mph27 km/h NortheastWindy
12pm60°F16°C18 mph28 km/h NortheastWindy
1pm60°F15°C18 mph28 km/h NortheastWindy
2pm59°F15°C17 mph27 km/h NortheastWindy
3pm57°F14°C16 mph26 km/h NortheastWindy
4pm56°F14°C16 mph25 km/h NortheastWindy
5pm55°F13°C15 mph24 km/h NortheastWindy
6pm55°F13°C15 mph23 km/h NortheastClear
7pm55°F13°C15 mph24 km/h NortheastClear
8pm55°F13°C14 mph23 km/h EastClear
9pm55°F13°C14 mph23 km/h EastClear
10pm55°F13°C14 mph22 km/h EastClear
DateLowHighWindDayNight
May 851°F10°C60°F16°C17 mph27 km/h from NortheastWindyClear
May 954°F12°C63°F17°C15 mph24 km/h from EastMostly CloudyRain
May 1056°F13°C60°F16°C7 mph12 km/h from SoutheastDrizzleMostly Cloudy
May 1155°F13°C61°F16°C7 mph12 km/h from SoutheastMostly CloudyPartly Cloudy
May 1255°F13°C61°F16°C7 mph12 km/h from EastPartly CloudyPartly Cloudy
May 1356°F13°C65°F18°C12 mph19 km/h from NortheastMostly ClearWindy
May 1455°F13°C61°F16°C15 mph25 km/h from NortheastWindyClear

Yes

Low of 55°F13°C, High of 64°F18°C
Wind: 15 mph24 km/h
Precipitation: 16% rain

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