Yes

you do need a jacket based on the weather in Dartmouth (Smith Mills), Massachusetts, United States 1 second ago

Why? Because just cool enough for a jacket, but not warm enough to ditch it and it's fairly windy outside!
58°F14°C & Mostly Clear

Wind is 8 mph13 km/h from the Southwest, gusting to 19 mph31 km/h
May 7
9pm57°F14°C8 mph13 km/h SouthwestMostly Clear
10pm57°F14°C7 mph12 km/h SouthwestClear
11pm56°F13°C6 mph10 km/h SouthwestClear
May 8
12am55°F13°C6 mph10 km/h SouthwestClear
1am55°F13°C6 mph10 km/h SouthwestPartly Cloudy
2am54°F12°C6 mph9 km/h SouthwestMostly Clear
3am53°F12°C5 mph8 km/h SouthwestPartly Cloudy
4am53°F12°C4 mph6 km/h SouthwestPartly Cloudy
5am53°F12°C4 mph6 km/h SouthwestMostly Cloudy
6am53°F12°C3 mph5 km/h SouthwestMostly Cloudy
7am56°F13°C2 mph4 km/h WestMostly Cloudy
8am60°F15°C2 mph4 km/h WestMostly Cloudy
DateLowHighWindDayNight
May 754°F12°C67°F20°C6 mph10 km/h from SouthPartly CloudyMostly Clear
May 853°F12°C70°F21°C4 mph7 km/h from SouthMostly CloudyDrizzle
May 952°F11°C61°F16°C9 mph14 km/h from EastRainRain
May 1051°F11°C64°F18°C13 mph21 km/h from WestDrizzleClear
May 1151°F10°C70°F21°C6 mph10 km/h from NorthwestMostly ClearClear
May 1248°F9°C66°F19°C10 mph16 km/h from SouthwestMostly ClearPartly Cloudy
May 1352°F11°C68°F20°C9 mph15 km/h from SouthwestCloudyCloudy

Yes

Low of 53°F12°C, High of 70°F21°C
Wind: 4 mph7 km/h
Precipitation: 15% rain

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