Yes

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

Why? Because it's not very warm out and it's on the windy side!
54°F12°C & Clear

Wind is 9 mph14 km/h from the North, gusting to 19 mph31 km/h
November 15
1pm55°F13°C9 mph14 km/h NorthClear
2pm56°F13°C10 mph16 km/h NorthClear
3pm55°F13°C9 mph14 km/h NorthClear
4pm51°F11°C7 mph11 km/h NorthwestClear
5pm47°F8°C6 mph9 km/h NorthwestClear
6pm45°F7°C6 mph9 km/h NorthwestClear
7pm42°F6°C5 mph9 km/h NorthMostly Clear
8pm41°F5°C5 mph8 km/h NorthMostly Clear
9pm40°F5°C4 mph7 km/h NorthwestClear
10pm40°F4°C4 mph6 km/h NorthwestMostly Clear
11pm39°F4°C4 mph6 km/h NorthwestClear
November 16
12am37°F3°C3 mph5 km/h NorthwestClear
DateLowHighWindDayNight
November 1525°F-4°C56°F13°C6 mph9 km/h from NorthMostly ClearClear
November 1632°F0°C57°F14°C8 mph12 km/h from NorthwestClearClear
November 1731°F-0°C59°F15°C5 mph8 km/h from NorthMostly ClearMostly Cloudy
November 1836°F2°C56°F14°C7 mph11 km/h from NorthwestPartly CloudyMostly Clear
November 1936°F2°C53°F12°C6 mph10 km/h from NorthwestMostly ClearPartly Cloudy
November 2032°F0°C53°F12°C2 mph3 km/h from EastPartly CloudyCloudy
November 2142°F6°C53°F12°C11 mph18 km/h from EastRainRain

Yes

Low of 32°F0°C, High of 56°F14°C
Wind: 8 mph12 km/h
Precipitation: None

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