Yes

you do need a jacket based on the weather in Nantucket, MA, USA 1 second ago

Why? Because the wind is harsh and biting!
67°F20°C & Cloudy

Wind is 12 mph20 km/h from the East, gusting to 24 mph38 km/h
September 17
11pm67°F20°C13 mph21 km/h EastCloudy
September 18
12am67°F19°C12 mph19 km/h EastCloudy
1am67°F19°C11 mph18 km/h SoutheastCloudy
2am67°F19°C10 mph16 km/h SoutheastCloudy
3am66°F19°C9 mph14 km/h SoutheastCloudy
4am66°F19°C7 mph11 km/h SoutheastCloudy
5am66°F19°C5 mph9 km/h SoutheastThunderstorms
6am66°F19°C5 mph8 km/h SouthCloudy
7am66°F19°C5 mph7 km/h NorthwestCloudy
8am67°F19°C5 mph8 km/h NorthwestCloudy
9am68°F20°C5 mph7 km/h NorthCloudy
10am68°F20°C4 mph7 km/h NorthCloudy
DateLowHighWindDayNight
September 1761°F16°C69°F20°C11 mph17 km/h from EastRainThunderstorms
September 1866°F19°C71°F22°C5 mph9 km/h from NorthwestDrizzleMostly Clear
September 1964°F18°C72°F22°C9 mph14 km/h from NorthMostly ClearMostly Clear
September 2058°F14°C64°F18°C12 mph19 km/h from NortheastClearClear
September 2157°F14°C63°F17°C10 mph16 km/h from EastPartly CloudyMostly Cloudy
September 2259°F15°C69°F20°C9 mph14 km/h from SouthMostly ClearMostly Clear
September 2363°F17°C71°F22°C13 mph20 km/h from SouthwestPartly CloudyDrizzle

No

Low of 66°F19°C, High of 72°F22°C
Wind: 5 mph9 km/h
Precipitation: 31% rain

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