Yes

you do need a jacket based on the weather in Stamford, CT 06907, USA 1 second ago

Why? Because it's cool. Pleasantly cool, but cool.
51°F11°C & Clear

Wind is 4 mph7 km/h from the SE, gusting to 9 mph15 km/h
April 25
1pm52°F11°C5 mph8 km/h SEMostly Clear
2pm54°F12°C5 mph8 km/h SEClear
3pm55°F13°C5 mph9 km/h SEClear
4pm56°F14°C5 mph8 km/h SEClear
5pm57°F14°C5 mph7 km/h SClear
6pm56°F13°C5 mph8 km/h SClear
7pm52°F11°C8 mph12 km/h SClear
8pm47°F9°C7 mph12 km/h SMostly Clear
9pm44°F7°C6 mph10 km/h SClear
10pm42°F5°C5 mph8 km/h SClear
11pm40°F5°C4 mph6 km/h SClear
April 26
12am39°F4°C3 mph4 km/h SClear
DateLowHighWindDayNight
April 2538°F3°C57°F14°C4 mph7 km/h from SEMostly ClearClear
April 2635°F1°C61°F16°C5 mph8 km/h from SEClearClear
April 2737°F3°C61°F16°C8 mph13 km/h from SMostly CloudyDrizzle
April 2845°F7°C73°F23°C6 mph10 km/h from SWMostly CloudyMostly Cloudy
April 2954°F12°C80°F27°C4 mph7 km/h from EPartly CloudyPartly Cloudy
April 3051°F11°C70°F21°C8 mph12 km/h from SEPartly CloudyRain
May 152°F11°C78°F25°C5 mph8 km/h from SWMostly ClearPartly Cloudy

Yes

Low of 35°F2°C, High of 61°F16°C
Wind: 5 mph8 km/h
Precipitation: None

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