Yes

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

Why? Because it's cool. Pleasantly cool, but cool and it's so windy, your hat will probably launch into orbit!
51°F11°C & Windy

Wind is 17 mph27 km/h from the Northwest, gusting to 31 mph50 km/h
April 27
2pm51°F11°C17 mph27 km/h NorthwestWindy
3pm50°F10°C17 mph27 km/h NorthwestWindy
4pm49°F9°C17 mph27 km/h NorthwestWindy
5pm48°F9°C16 mph26 km/h NorthwestWindy
6pm48°F9°C15 mph24 km/h NorthwestWindy
7pm48°F9°C15 mph24 km/h NorthwestMostly Cloudy
8pm47°F9°C14 mph22 km/h NorthwestPartly Cloudy
9pm48°F9°C13 mph21 km/h NorthwestMostly Cloudy
10pm50°F10°C12 mph19 km/h NorthwestMostly Cloudy
11pm50°F10°C11 mph17 km/h NorthwestMostly Cloudy
April 28
12am50°F10°C10 mph16 km/h NorthwestMostly Clear
1am50°F10°C11 mph18 km/h NorthwestClear
DateLowHighWindDayNight
April 2743°F6°C52°F11°C12 mph19 km/h from NorthwestCloudyMostly Clear
April 2848°F9°C72°F22°C8 mph13 km/h from NorthwestClearMostly Clear
April 2948°F9°C76°F25°C11 mph18 km/h from SouthwestPartly CloudyMostly Cloudy
April 3049°F10°C70°F21°C11 mph18 km/h from NorthwestMostly ClearPartly Cloudy
May 143°F6°C62°F17°C5 mph9 km/h from SoutheastMostly CloudyRain
May 249°F10°C76°F24°C9 mph14 km/h from SouthRainPartly Cloudy
May 343°F6°C62°F17°C10 mph16 km/h from WestPartly CloudyMostly Clear

Yes

Low of 48°F9°C, High of 72°F22°C
Wind: 8 mph13 km/h
Precipitation: None

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