Yes

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

Why? Because it's cool. Pleasantly cool, but cool!
57°F14°C & Cloudy

Wind is 6 mph10 km/h from the Southwest, gusting to 13 mph21 km/h
April 3
10pm57°F14°C6 mph10 km/h SouthwestHaze
11pm57°F14°C6 mph10 km/h SouthwestHaze
April 4
12am56°F14°C5 mph9 km/h WestHaze
1am57°F14°C5 mph8 km/h WestDrizzle
2am58°F14°C3 mph6 km/h WestCloudy
3am57°F14°C4 mph6 km/h NorthwestCloudy
4am57°F14°C5 mph9 km/h NorthwestCloudy
5am56°F13°C6 mph10 km/h NorthwestDrizzle
6am54°F12°C5 mph8 km/h NorthwestCloudy
7am53°F12°C4 mph6 km/h NorthwestCloudy
8am53°F12°C5 mph8 km/h NorthwestCloudy
9am52°F11°C6 mph10 km/h NorthwestCloudy
DateLowHighWindDayNight
April 342°F6°C59°F15°C4 mph6 km/h from SouthRainRain
April 449°F9°C61°F16°C7 mph12 km/h from NorthwestCloudyMostly Cloudy
April 544°F7°C49°F9°C12 mph19 km/h from SoutheastRainDrizzle
April 644°F7°C56°F13°C7 mph11 km/h from NorthwestDrizzleRain
April 739°F4°C45°F7°C8 mph13 km/h from NortheastRainCloudy
April 832°F-0°C45°F7°C14 mph22 km/h from WestDrizzleClear
April 930°F-1°C45°F7°C8 mph13 km/h from WestMostly ClearPartly Cloudy

Yes

Low of 49°F10°C, High of 61°F16°C
Wind: 7 mph12 km/h
Precipitation: 29% rain

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