Yes

you do need a jacket based on the weather in Garden City, NY 11530, USA 1 second ago

Why? Because it's on the windy side!
61°F16°C & Clear

Wind is 10 mph16 km/h from the Northeast, gusting to 20 mph32 km/h
September 20
9am63°F17°C11 mph17 km/h NortheastClear
10am66°F19°C10 mph17 km/h NortheastClear
11am69°F21°C10 mph15 km/h NortheastClear
12pm71°F22°C8 mph14 km/h NortheastClear
1pm73°F23°C7 mph12 km/h NortheastClear
2pm75°F24°C7 mph12 km/h NortheastClear
3pm74°F24°C7 mph11 km/h EastClear
4pm74°F23°C7 mph11 km/h EastClear
5pm73°F23°C7 mph12 km/h EastClear
6pm71°F21°C8 mph13 km/h SoutheastClear
7pm68°F20°C8 mph12 km/h SoutheastClear
8pm66°F19°C7 mph11 km/h SoutheastMostly Clear
DateLowHighWindDayNight
September 2060°F15°C75°F24°C8 mph14 km/h from NortheastClearPartly Cloudy
September 2158°F14°C70°F21°C8 mph13 km/h from EastMostly CloudyMostly Clear
September 2255°F13°C72°F22°C5 mph9 km/h from SouthMostly ClearPartly Cloudy
September 2364°F18°C79°F26°C7 mph12 km/h from SouthwestPartly CloudyThunderstorms
September 2466°F19°C78°F25°C5 mph8 km/h from NorthDrizzleDrizzle
September 2563°F17°C71°F22°C9 mph15 km/h from EastHeavy RainRain
September 2663°F17°C73°F23°C6 mph10 km/h from SouthRainMostly Cloudy

Yes

Low of 58°F15°C, High of 70°F21°C
Wind: 8 mph13 km/h
Precipitation: None

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