Yes

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

Why? Because it's cold. simple as that.
38°F4°C & Drizzle

Wind is 12 mph20 km/h from the NW, gusting to 29 mph47 km/h
March 29
7am38°F3°C12 mph19 km/h NWRain
8am38°F3°C10 mph17 km/h NWRain
9am38°F3°C11 mph18 km/h NWRain
10am39°F4°C12 mph19 km/h NWDrizzle
11am41°F5°C13 mph20 km/h NWCloudy
12pm43°F6°C13 mph21 km/h NWCloudy
1pm46°F8°C15 mph23 km/h NWCloudy
2pm47°F8°C16 mph26 km/h NWWindy
3pm48°F9°C16 mph25 km/h NWWindy
4pm48°F9°C16 mph25 km/h NWWindy
5pm48°F9°C15 mph24 km/h NWCloudy
6pm47°F8°C14 mph23 km/h NWCloudy
DateLowHighWindDayNight
March 2938°F3°C48°F9°C13 mph22 km/h from NWRainPartly Cloudy
March 3035°F2°C54°F12°C13 mph21 km/h from WMostly ClearMostly Cloudy
March 3137°F3°C53°F12°C9 mph14 km/h from NWMostly CloudyPartly Cloudy
April 133°F1°C53°F12°C4 mph6 km/h from SEMostly CloudyMostly Cloudy
April 238°F3°C46°F8°C7 mph11 km/h from ERainRain
April 335°F2°C41°F5°C15 mph24 km/h from NERainRain
April 436°F2°C45°F7°C15 mph25 km/h from NWDrizzleMostly Cloudy

Yes

Low of 35°F2°C, High of 55°F13°C
Wind: 13 mph21 km/h
Precipitation: None

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