Yes

you do need a jacket based on the weather in Levittown, NY 11756, USA 1 second ago

Why? Because you're not freezing, but you’ll definitely start complaining if it lasts much longer!
45°F7°C & Clear

Wind is 5 mph8 km/h from the Northwest, gusting to 11 mph18 km/h
October 18
10am45°F7°C5 mph8 km/h NorthwestClear
11am45°F7°C5 mph8 km/h NorthClear
12pm46°F8°C4 mph7 km/h NorthMostly Clear
1pm51°F10°C5 mph8 km/h NorthMostly Clear
2pm54°F12°C5 mph8 km/h NorthMostly Clear
3pm58°F15°C3 mph5 km/h NorthMostly Clear
4pm61°F16°C2 mph3 km/h NorthwestPartly Cloudy
5pm63°F17°C3 mph4 km/h SouthwestPartly Cloudy
6pm64°F18°C3 mph6 km/h SouthwestMostly Cloudy
7pm65°F19°C4 mph6 km/h SouthwestPartly Cloudy
8pm65°F18°C5 mph8 km/h SouthwestPartly Cloudy
9pm64°F18°C5 mph9 km/h SouthMostly Cloudy
DateLowHighWindDayNight
October 1845°F7°C65°F19°C4 mph6 km/h from WestPartly CloudyMostly Clear
October 1957°F14°C69°F21°C13 mph20 km/h from SouthPartly CloudyRain
October 2054°F12°C65°F19°C15 mph24 km/h from SouthwestHeavy RainMostly Clear
October 2150°F10°C63°F17°C10 mph16 km/h from SouthwestClearPartly Cloudy
October 2250°F10°C62°F17°C9 mph14 km/h from WestRainMostly Clear
October 2347°F8°C57°F14°C9 mph15 km/h from WestPartly CloudyClear
October 2443°F6°C58°F14°C7 mph12 km/h from NorthwestMostly ClearMostly Cloudy

Yes

Low of 56°F14°C, High of 69°F21°C
Wind: 13 mph20 km/h
Precipitation: None

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