Yes

you do need a jacket based on the weather in Holyoke, MA 01040, USA 1 second ago

Why? Because it's quite chilly.
41°F5°C & Clear

Wind is 2 mph3 km/h from the S, gusting to 5 mph8 km/h
April 26
1am39°F4°C2 mph3 km/h NClear
2am37°F3°C4 mph6 km/h NClear
3am35°F2°C4 mph6 km/h NClear
4am33°F1°C4 mph7 km/h NClear
5am32°F0°C4 mph7 km/h NClear
6am32°F-0°C4 mph7 km/h NClear
7am34°F1°C4 mph7 km/h NClear
8am39°F4°C4 mph7 km/h NClear
9am44°F6°C5 mph8 km/h NClear
10am48°F9°C5 mph8 km/h NEClear
11am51°F11°C4 mph6 km/h NEClear
12pm55°F13°C3 mph5 km/h NClear
DateLowHighWindDayNight
April 2632°F-0°C61°F16°C3 mph5 km/h from NClearClear
April 2735°F1°C65°F18°C6 mph9 km/h from SPartly CloudyCloudy
April 2843°F6°C71°F21°C7 mph10 km/h from SMostly CloudyMostly Cloudy
April 2953°F12°C75°F24°C5 mph7 km/h from NEMostly CloudyMostly Cloudy
April 3052°F11°C67°F19°C7 mph12 km/h from SDrizzleRain
May 151°F11°C69°F20°C5 mph8 km/h from SEDrizzleDrizzle
May 251°F11°C67°F19°C4 mph7 km/h from NWDrizzleMostly Cloudy

Yes

Low of 35°F2°C, High of 65°F19°C
Wind: 6 mph9 km/h
Precipitation: None

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