Yes

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

Why? Because it's cool. Pleasantly cool, but cool!
53°F12°C & Mostly Cloudy

Wind is 8 mph13 km/h from the West, gusting to 18 mph29 km/h
May 25
2am53°F12°C9 mph14 km/h WestPartly Cloudy
3am51°F11°C8 mph13 km/h WestClear
4am51°F10°C8 mph13 km/h WestMostly Clear
5am50°F10°C9 mph14 km/h WestClear
6am50°F10°C8 mph13 km/h WestClear
7am53°F11°C9 mph14 km/h NorthwestClear
8am55°F13°C11 mph17 km/h NorthwestMostly Clear
9am57°F14°C11 mph18 km/h NorthwestMostly Clear
10am59°F15°C11 mph18 km/h NorthwestPartly Cloudy
11am61°F16°C12 mph19 km/h NorthwestPartly Cloudy
12pm62°F17°C12 mph19 km/h NorthwestMostly Cloudy
1pm63°F17°C12 mph19 km/h NorthwestMostly Cloudy
DateLowHighWindDayNight
May 2550°F10°C65°F18°C11 mph18 km/h from NorthwestMostly CloudyMostly Clear
May 2651°F11°C68°F20°C5 mph8 km/h from NorthwestMostly ClearMostly Clear
May 2754°F12°C68°F20°C6 mph10 km/h from SouthMostly CloudyMostly Cloudy
May 2855°F13°C65°F19°C6 mph9 km/h from SoutheastDrizzleDrizzle
May 2958°F14°C66°F19°C11 mph18 km/h from SouthRainDrizzle
May 3059°F15°C71°F21°C9 mph14 km/h from SouthwestPartly CloudyPartly Cloudy
May 3156°F14°C67°F20°C5 mph9 km/h from SouthwestDrizzleMostly Clear

Yes

Low of 51°F11°C, High of 68°F20°C
Wind: 5 mph8 km/h
Precipitation: 5% rain

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