Yes

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

Why? Because the wind could blow a wig clean off your head!
68°F20°C & Clear

Wind is 10 mph16 km/h from the South, gusting to 20 mph32 km/h
August 23
10pm68°F20°C10 mph17 km/h SouthClear
11pm67°F19°C11 mph18 km/h SouthClear
August 24
12am67°F19°C11 mph18 km/h SouthClear
1am67°F19°C11 mph18 km/h SouthMostly Clear
2am67°F19°C11 mph17 km/h SouthMostly Clear
3am67°F19°C11 mph18 km/h SouthCloudy
4am66°F19°C10 mph17 km/h SouthCloudy
5am67°F19°C11 mph17 km/h SouthMostly Cloudy
6am67°F19°C11 mph18 km/h SouthMostly Cloudy
7am68°F20°C11 mph18 km/h SouthMostly Cloudy
8am69°F20°C12 mph20 km/h SouthMostly Cloudy
9am70°F21°C13 mph21 km/h SouthMostly Cloudy
DateLowHighWindDayNight
August 2361°F16°C77°F25°C9 mph14 km/h from SouthClearPartly Cloudy
August 2466°F19°C74°F23°C14 mph22 km/h from SouthMostly CloudyRain
August 2567°F19°C75°F24°C11 mph18 km/h from NorthRainMostly Clear
August 2667°F19°C72°F22°C11 mph18 km/h from WestMostly ClearMostly Cloudy
August 2765°F18°C70°F21°C7 mph11 km/h from NorthwestMostly ClearClear
August 2863°F17°C70°F21°C12 mph20 km/h from SouthwestMostly ClearWindy
August 2965°F18°C72°F22°C14 mph22 km/h from SouthwestMostly ClearMostly Clear

No

Low of 66°F19°C, High of 73°F23°C
Wind: 14 mph22 km/h
Precipitation: None

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