Yes

you do need a jacket based on the weather in Cambridge, MA 02140, USA 1 second ago

Why? Because it's not very warm out and it's so windy, your hat has officially retired from your head!
51°F11°C & Cloudy

Wind is 10 mph16 km/h from the East, gusting to 20 mph32 km/h
May 9
11am51°F11°C11 mph17 km/h EastCloudy
12pm52°F11°C11 mph18 km/h EastCloudy
1pm52°F11°C11 mph18 km/h EastDrizzle
2pm52°F11°C11 mph18 km/h NortheastDrizzle
3pm51°F11°C11 mph17 km/h NortheastRain
4pm51°F10°C10 mph17 km/h EastRain
5pm51°F11°C11 mph18 km/h EastRain
6pm51°F10°C10 mph16 km/h EastRain
7pm51°F10°C11 mph18 km/h EastRain
8pm50°F10°C12 mph19 km/h EastRain
9pm50°F10°C12 mph20 km/h EastDrizzle
10pm50°F10°C12 mph19 km/h EastRain
DateLowHighWindDayNight
May 950°F10°C56°F14°C10 mph16 km/h from NortheastRainRain
May 1050°F10°C63°F17°C11 mph17 km/h from NorthwestDrizzleClear
May 1151°F11°C67°F20°C11 mph18 km/h from NorthwestClearClear
May 1247°F8°C75°F24°C10 mph16 km/h from SouthwestMostly ClearPartly Cloudy
May 1358°F14°C73°F23°C7 mph12 km/h from SouthMostly CloudyCloudy
May 1459°F15°C72°F22°C6 mph9 km/h from SouthCloudyMostly Cloudy
May 1561°F16°C73°F23°C4 mph7 km/h from SouthDrizzleMostly Cloudy

Yes

Low of 50°F10°C, High of 64°F18°C
Wind: 11 mph17 km/h
Precipitation: 73% rain

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