Yes

you do need a jacket based on the weather in Long Island, New York, USA 1 second ago

Why? Because it's cold enough that makes you wish you had a hat, but you're still too proud to admit it!
40°F4°C & Cloudy

Wind is 8 mph13 km/h from the Northeast, gusting to 17 mph28 km/h
March 14
3am39°F4°C8 mph13 km/h NortheastCloudy
4am39°F4°C8 mph12 km/h NortheastMostly Cloudy
5am39°F4°C8 mph12 km/h NortheastMostly Cloudy
6am39°F4°C7 mph11 km/h NortheastMostly Cloudy
7am38°F3°C6 mph10 km/h NortheastMostly Cloudy
8am39°F4°C7 mph11 km/h NortheastMostly Cloudy
9am41°F5°C7 mph11 km/h NortheastMostly Cloudy
10am43°F6°C7 mph11 km/h NortheastPartly Cloudy
11am46°F8°C6 mph10 km/h NortheastPartly Cloudy
12pm49°F10°C5 mph8 km/h NortheastPartly Cloudy
1pm52°F11°C5 mph8 km/h EastPartly Cloudy
2pm54°F12°C5 mph9 km/h SoutheastMostly Clear
DateLowHighWindDayNight
March 1438°F3°C55°F13°C6 mph9 km/h from EastPartly CloudyMostly Cloudy
March 1540°F4°C49°F10°C6 mph10 km/h from SoutheastCloudyCloudy
March 1649°F9°C58°F15°C17 mph27 km/h from SouthWindyRain
March 1741°F5°C56°F13°C9 mph14 km/h from NorthwestRainClear
March 1836°F2°C54°F12°C6 mph10 km/h from SouthwestClearMostly Clear
March 1941°F5°C54°F12°C8 mph13 km/h from SouthPartly CloudyMostly Cloudy
March 2044°F7°C54°F12°C14 mph22 km/h from SouthCloudyDrizzle

Yes

Low of 40°F5°C, High of 49°F10°C
Wind: 6 mph10 km/h
Precipitation: None

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