Yes

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

Why? Because some drizzle out there!
66°F19°C & Drizzle

Wind is 4 mph6 km/h from the Northwest, gusting to 9 mph15 km/h
September 7
1pm66°F19°C4 mph6 km/h NorthwestDrizzle
2pm67°F19°C5 mph8 km/h NorthwestDrizzle
3pm67°F20°C4 mph7 km/h NorthwestDrizzle
4pm68°F20°C4 mph6 km/h NorthwestCloudy
5pm67°F20°C2 mph4 km/h WestCloudy
6pm67°F20°C2 mph4 km/h SouthwestCloudy
7pm66°F19°C3 mph4 km/h SouthwestCloudy
8pm65°F18°C3 mph5 km/h SouthwestPartly Cloudy
9pm63°F17°C3 mph5 km/h SouthwestPartly Cloudy
10pm63°F17°C3 mph6 km/h WestMostly Clear
11pm62°F17°C4 mph7 km/h NorthwestMostly Cloudy
September 8
12am61°F16°C6 mph10 km/h NorthPartly Cloudy
DateLowHighWindDayNight
September 760°F16°C68°F20°C3 mph5 km/h from NorthwestRainPartly Cloudy
September 855°F13°C72°F22°C6 mph10 km/h from NorthMostly ClearClear
September 956°F13°C72°F22°C8 mph13 km/h from NortheastPartly CloudyPartly Cloudy
September 1058°F14°C71°F22°C8 mph14 km/h from NortheastMostly CloudyMostly Clear
September 1157°F14°C77°F25°C5 mph9 km/h from NorthClearClear
September 1261°F16°C74°F23°C7 mph10 km/h from NortheastMostly ClearMostly Clear
September 1359°F15°C72°F22°C5 mph8 km/h from SoutheastMostly ClearMostly Clear

Yes

Low of 55°F13°C, High of 72°F22°C
Wind: 6 mph10 km/h
Precipitation: None

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