Yes

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

Why? Because it's bitterly cold.
40°F4°C & Cloudy

Wind is 12 mph19 km/h from the NW, gusting to 28 mph45 km/h
March 29
5am39°F4°C12 mph20 km/h NWRain
6am38°F4°C12 mph20 km/h NWDrizzle
7am38°F3°C11 mph18 km/h NWRain
8am37°F3°C10 mph16 km/h NWRain
9am38°F3°C10 mph17 km/h NWRain
10am39°F4°C11 mph18 km/h NWDrizzle
11am41°F5°C12 mph20 km/h NWCloudy
12pm43°F6°C13 mph21 km/h NWCloudy
1pm46°F8°C15 mph24 km/h NWCloudy
2pm47°F8°C15 mph25 km/h NWWindy
3pm48°F9°C16 mph25 km/h NWWindy
4pm48°F9°C16 mph25 km/h NWWindy
DateLowHighWindDayNight
March 2937°F3°C49°F9°C13 mph21 km/h from NWRainPartly Cloudy
March 3034°F1°C55°F13°C12 mph20 km/h from WMostly ClearMostly Cloudy
March 3136°F2°C53°F12°C8 mph14 km/h from NWPartly CloudyPartly Cloudy
April 132°F-0°C55°F13°C3 mph5 km/h from SMostly CloudyMostly Cloudy
April 236°F2°C45°F7°C7 mph11 km/h from ERainRain
April 334°F1°C41°F5°C14 mph23 km/h from NERainRain
April 435°F2°C44°F7°C15 mph24 km/h from NWDrizzleMostly Cloudy

Yes

Low of 34°F1°C, High of 55°F13°C
Wind: 12 mph20 km/h
Precipitation: None

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