Yes

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

Why? Because it's cool. Pleasantly cool, but cool!
50°F10°C & Cloudy

Wind is 6 mph10 km/h from the South, gusting to 17 mph28 km/h
May 2
3am50°F10°C7 mph11 km/h SouthCloudy
4am51°F11°C7 mph11 km/h SouthCloudy
5am52°F11°C7 mph12 km/h SouthThunderstorms
6am52°F11°C8 mph13 km/h SouthDrizzle
7am52°F11°C9 mph14 km/h SouthThunderstorms
8am55°F13°C7 mph12 km/h SouthCloudy
9am57°F14°C7 mph12 km/h SouthCloudy
10am60°F16°C8 mph12 km/h SouthwestCloudy
11am64°F18°C8 mph13 km/h SouthwestCloudy
12pm68°F20°C8 mph12 km/h SouthwestCloudy
1pm72°F22°C9 mph14 km/h SouthwestMostly Cloudy
2pm75°F24°C9 mph14 km/h SouthwestMostly Cloudy
DateLowHighWindDayNight
May 250°F10°C79°F26°C8 mph13 km/h from SouthwestThunderstormsPartly Cloudy
May 359°F15°C82°F28°C8 mph12 km/h from SouthwestRainRain
May 453°F11°C63°F17°C5 mph8 km/h from NortheastCloudyRain
May 549°F10°C53°F12°C8 mph13 km/h from NortheastRainCloudy
May 649°F9°C65°F18°C6 mph10 km/h from EastRainRain
May 757°F14°C72°F22°C9 mph15 km/h from WestPartly CloudyMostly Cloudy
May 848°F9°C69°F20°C9 mph14 km/h from NorthPartly CloudyMostly Clear

No

Low of 59°F15°C, High of 82°F28°C
Wind: 8 mph12 km/h
Precipitation: 30% rain

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