Yes

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

Why? Because the wind could blow a wig clean off your head!
61°F16°C & Clear

Wind is 13 mph21 km/h from the North, gusting to 19 mph31 km/h
July 3
1am61°F16°C13 mph21 km/h NorthClear
2am62°F16°C12 mph20 km/h NorthClear
3am62°F17°C11 mph18 km/h NorthClear
4am63°F17°C10 mph16 km/h NortheastClear
5am65°F18°C9 mph14 km/h NortheastClear
6am66°F19°C9 mph14 km/h NortheastClear
7am66°F19°C9 mph14 km/h NorthClear
8am67°F19°C10 mph16 km/h NorthClear
9am67°F20°C12 mph19 km/h NorthClear
10am67°F19°C14 mph23 km/h NorthClear
11am67°F19°C16 mph25 km/h NorthWindy
12pm66°F19°C15 mph25 km/h NorthWindy
DateLowHighWindDayNight
July 261°F16°C67°F20°C12 mph19 km/h from NorthClearClear
July 360°F16°C67°F19°C8 mph13 km/h from NorthwestPartly CloudyMostly Cloudy
July 461°F16°C65°F18°C14 mph23 km/h from WestCloudyThunderstorms
July 561°F16°C64°F18°C18 mph29 km/h from WestDrizzleWindy
July 660°F16°C64°F18°C20 mph32 km/h from NorthwestWindyWindy
July 760°F16°C65°F18°C12 mph20 km/h from NorthwestMostly ClearMostly Clear
July 861°F16°C68°F20°C8 mph13 km/h from NorthwestMostly ClearMostly Clear

No

Low of 61°F16°C, High of 66°F19°C
Wind: 8 mph13 km/h
Precipitation: None

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