Yes

you do need a jacket based on the weather in Setauket- East Setauket, NY, USA 1 second ago

Why? Because the cold's there, but it's just a reminder, not an invasion and it's so windy, even the squirrels are holding onto branches for dear life!
46°F8°C & Haze

Wind is 11 mph18 km/h from the Southeast, gusting to 19 mph31 km/h
March 20
6pm46°F8°C11 mph18 km/h SoutheastHaze
7pm46°F8°C11 mph18 km/h SoutheastHaze
8pm46°F8°C9 mph15 km/h SoutheastHaze
9pm47°F8°C8 mph13 km/h SoutheastHaze
10pm47°F8°C7 mph11 km/h SouthHaze
11pm47°F8°C7 mph11 km/h SoutheastFoggy
March 21
12am48°F9°C5 mph8 km/h SoutheastDrizzle
1am47°F8°C5 mph8 km/h EastRain
2am46°F8°C5 mph8 km/h NorthwestRain
3am46°F8°C9 mph14 km/h NorthwestDrizzle
4am45°F7°C14 mph22 km/h NorthwestDrizzle
5am44°F7°C15 mph24 km/h NorthwestWindy
DateLowHighWindDayNight
March 2041°F5°C51°F10°C6 mph10 km/h from SoutheastCloudyRain
March 2140°F5°C49°F9°C18 mph28 km/h from NorthwestWindyMostly Clear
March 2237°F3°C54°F12°C10 mph16 km/h from SouthwestMostly CloudyMostly Clear
March 2329°F-1°C45°F7°C8 mph13 km/h from NorthwestMostly ClearRain
March 2437°F3°C51°F11°C11 mph18 km/h from SouthRainDrizzle
March 2542°F6°C51°F11°C11 mph17 km/h from WestPartly CloudyRain
March 2637°F3°C47°F9°C10 mph17 km/h from WestRainMostly Clear

Yes

Low of 40°F5°C, High of 49°F10°C
Wind: 18 mph28 km/h
Precipitation: None

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