Yes

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

Why? Because it's quite chilly.
47°F8°C & Drizzle

Wind is 8 mph13 km/h from the N, gusting to 11 mph18 km/h
March 28
2pm47°F8°C9 mph15 km/h NRain
3pm47°F8°C10 mph16 km/h NRain
4pm46°F8°C11 mph18 km/h NRain
5pm46°F8°C12 mph19 km/h NRain
6pm45°F7°C13 mph21 km/h NRain
7pm45°F7°C14 mph22 km/h NRain
8pm44°F7°C15 mph24 km/h NRain
9pm44°F7°C15 mph25 km/h NRain
10pm44°F7°C16 mph26 km/h NRain
11pm44°F7°C16 mph26 km/h NRain
March 29
12am44°F6°C16 mph26 km/h NRain
1am43°F6°C18 mph29 km/h NRain
DateLowHighWindDayNight
March 2843°F6°C47°F8°C9 mph15 km/h from NRainRain
March 2939°F4°C45°F7°C24 mph39 km/h from NWRainWindy
March 3037°F3°C50°F10°C19 mph30 km/h from WWindyMostly Cloudy
March 3139°F4°C48°F9°C9 mph14 km/h from NWMostly CloudyMostly Clear
April 138°F3°C46°F8°C7 mph11 km/h from NPartly CloudyMostly Cloudy
April 239°F4°C44°F7°C15 mph24 km/h from ERainRain
April 338°F3°C47°F8°C18 mph28 km/h from ERainDrizzle

Yes

Low of 39°F4°C, High of 45°F7°C
Wind: 24 mph39 km/h
Precipitation: 91% rain

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