Yes

you do need a jacket based on the weather in West Haven, CT 06516, USA 1 second ago

Why? Because it's cool. Pleasantly cool, but cool.
55°F13°C & Clear

Wind is 7 mph11 km/h from the S, gusting to 12 mph20 km/h
April 26
3pm56°F13°C8 mph12 km/h SClear
4pm56°F14°C7 mph12 km/h SClear
5pm57°F14°C7 mph11 km/h SClear
6pm56°F13°C6 mph10 km/h SClear
7pm53°F12°C7 mph12 km/h SClear
8pm50°F10°C7 mph11 km/h SClear
9pm48°F9°C6 mph9 km/h SClear
10pm46°F8°C6 mph9 km/h SClear
11pm44°F7°C6 mph9 km/h SClear
April 27
12am43°F6°C6 mph9 km/h SClear
1am42°F6°C5 mph8 km/h SClear
2am41°F5°C5 mph8 km/h SWClear
DateLowHighWindDayNight
April 2634°F1°C57°F14°C6 mph9 km/h from SEClearClear
April 2738°F3°C61°F16°C8 mph13 km/h from SPartly CloudyDrizzle
April 2845°F7°C65°F19°C7 mph11 km/h from SDrizzlePartly Cloudy
April 2954°F12°C76°F24°C5 mph8 km/h from NEPartly CloudyMostly Cloudy
April 3050°F10°C62°F17°C9 mph14 km/h from ERainRain
May 149°F10°C63°F17°C7 mph11 km/h from EMostly CloudyMostly Cloudy
May 247°F8°C65°F18°C6 mph10 km/h from SMostly CloudyMostly Cloudy

Yes

Low of 38°F4°C, High of 61°F16°C
Wind: 8 mph13 km/h
Precipitation: None

Support This Page