Yes

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

Why? Because light rain: when the sky can't decide if it’s serious or just messing with you and it's not very warm out and it's really really huffing out there!
54°F12°C & Drizzle

Wind is 17 mph27 km/h from the Northeast, gusting to 39 mph63 km/h
October 13
11am55°F13°C16 mph26 km/h NortheastDrizzle
12pm55°F13°C16 mph25 km/h NortheastRain
1pm56°F13°C15 mph24 km/h NortheastRain
2pm56°F14°C16 mph25 km/h NortheastDrizzle
3pm57°F14°C16 mph26 km/h NortheastDrizzle
4pm58°F15°C15 mph24 km/h NortheastThunderstorms
5pm59°F15°C17 mph27 km/h NortheastDrizzle
6pm59°F15°C16 mph26 km/h NortheastDrizzle
7pm59°F15°C16 mph26 km/h NortheastDrizzle
8pm59°F15°C16 mph26 km/h NortheastDrizzle
9pm58°F15°C16 mph26 km/h NortheastDrizzle
10pm58°F14°C16 mph25 km/h NortheastDrizzle
DateLowHighWindDayNight
October 1352°F11°C59°F15°C16 mph25 km/h from NortheastRainDrizzle
October 1453°F12°C61°F16°C12 mph19 km/h from NorthDrizzleMostly Cloudy
October 1545°F7°C62°F17°C10 mph16 km/h from NorthPartly CloudyMostly Clear
October 1642°F5°C54°F12°C11 mph18 km/h from NorthMostly ClearClear
October 1740°F5°C59°F15°C7 mph11 km/h from NorthClearMostly Clear
October 1845°F7°C65°F18°C4 mph7 km/h from SouthwestPartly CloudyPartly Cloudy
October 1956°F13°C70°F21°C10 mph16 km/h from SouthPartly CloudyDrizzle

Yes

Low of 53°F12°C, High of 61°F16°C
Wind: 12 mph19 km/h
Precipitation: 36% rain

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