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

Why? Because it's not very warm out.
51°F10°C & Mostly Clear

Wind is 14 mph22 km/h from the SW, gusting to 29 mph47 km/h
April 13
1am50°F10°C12 mph19 km/h SWMostly Clear
2am49°F10°C13 mph20 km/h SWMostly Clear
3am48°F9°C13 mph21 km/h SWPartly Cloudy
4am48°F9°C14 mph22 km/h SWPartly Cloudy
5am47°F8°C14 mph22 km/h SWMostly Cloudy
6am46°F8°C14 mph23 km/h WCloudy
7am46°F8°C15 mph23 km/h WMostly Cloudy
8am46°F8°C16 mph26 km/h WWindy
9am48°F9°C18 mph29 km/h WWindy
10am49°F9°C19 mph30 km/h WWindy
11am50°F10°C19 mph30 km/h WWindy
12pm51°F11°C19 mph31 km/h WWindy
April 1346°F8°C54°F12°C18 mph29 km/h from WWindyPartly Cloudy
April 1442°F5°C61°F16°C13 mph21 km/h from SWMostly CloudyMostly Cloudy
April 1549°F10°C67°F19°C8 mph12 km/h from NWMostly ClearMostly Clear
April 1644°F7°C67°F19°C6 mph10 km/h from WMostly ClearPartly Cloudy
April 1745°F7°C61°F16°C7 mph11 km/h from SEMostly CloudyRain
April 1851°F10°C65°F18°C8 mph12 km/h from NMostly CloudyPartly Cloudy
April 1947°F8°C60°F15°C9 mph14 km/h from SMostly CloudyDrizzle


Low of 42°F6°C, High of 61°F16°C
Wind: 13 mph21 km/h
Precipitation: 13% rain

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