Yes

you do need a jacket based on the weather in Mt Vernon, NY 10550, USA 4 minutes ago

Why? Because a jacket will keep you cozy, but you won't break a seat!
57°F14°C & Clear

Wind is 4 mph6 km/h from the North, gusting to 6 mph10 km/h
September 9
1am57°F14°C4 mph6 km/h NorthClear
2am56°F13°C4 mph7 km/h NorthClear
3am55°F13°C4 mph7 km/h NorthClear
4am54°F12°C4 mph7 km/h NorthClear
5am54°F12°C4 mph7 km/h NorthClear
6am53°F12°C5 mph8 km/h NortheastClear
7am54°F12°C5 mph8 km/h NorthClear
8am58°F14°C5 mph9 km/h NortheastClear
9am62°F17°C6 mph10 km/h NortheastClear
10am66°F19°C8 mph13 km/h NortheastClear
11am70°F21°C10 mph16 km/h EastClear
12pm72°F22°C11 mph17 km/h EastClear
DateLowHighWindDayNight
September 953°F12°C74°F23°C9 mph14 km/h from EastClearPartly Cloudy
September 1058°F14°C72°F22°C7 mph12 km/h from NortheastMostly CloudyMostly Clear
September 1158°F14°C79°F26°C6 mph10 km/h from NorthClearPartly Cloudy
September 1261°F16°C75°F24°C6 mph10 km/h from NortheastMostly ClearMostly Clear
September 1358°F14°C74°F23°C6 mph10 km/h from EastMostly ClearPartly Cloudy
September 1458°F14°C75°F24°C5 mph9 km/h from SoutheastPartly CloudyMostly Clear
September 1560°F16°C72°F22°C7 mph11 km/h from NortheastMostly CloudyPartly Cloudy

Yes

Low of 58°F15°C, High of 73°F23°C
Wind: 7 mph12 km/h
Precipitation: 27% rain

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