Yes

you do need a jacket based on the weather in Millburn, NJ 07041, USA 1 second ago

Why? Because it's cool. Pleasantly cool, but cool!
55°F13°C & Partly Cloudy

Wind is 4 mph6 km/h from the Northwest, gusting to 6 mph9 km/h
May 11
1am55°F13°C4 mph7 km/h NorthwestMostly Clear
2am54°F12°C4 mph7 km/h NorthwestClear
3am53°F12°C4 mph7 km/h NorthwestClear
4am52°F11°C5 mph8 km/h NorthwestClear
5am51°F11°C5 mph8 km/h NorthwestClear
6am51°F11°C6 mph10 km/h NorthwestClear
7am53°F12°C6 mph10 km/h NorthwestClear
8am58°F14°C5 mph9 km/h NorthwestClear
9am62°F17°C6 mph10 km/h NorthwestClear
10am65°F18°C8 mph14 km/h NorthwestClear
11am67°F20°C9 mph14 km/h NorthwestClear
12pm70°F21°C9 mph15 km/h NorthClear
DateLowHighWindDayNight
May 1151°F11°C73°F23°C8 mph12 km/h from NorthwestClearMostly Clear
May 1251°F10°C74°F23°C6 mph10 km/h from SoutheastMostly CloudyDrizzle
May 1358°F15°C66°F19°C7 mph11 km/h from SoutheastRainRain
May 1457°F14°C62°F17°C10 mph16 km/h from EastDrizzleDrizzle
May 1558°F14°C70°F21°C4 mph7 km/h from EastCloudyMostly Cloudy
May 1660°F16°C72°F22°C5 mph9 km/h from SouthMostly CloudyThunderstorms
May 1761°F16°C77°F25°C6 mph10 km/h from WestMostly CloudyPartly Cloudy

Yes

Low of 51°F11°C, High of 73°F23°C
Wind: 6 mph10 km/h
Precipitation: None

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