Yes

you do need a jacket based on the weather in Flemington, NJ 08822, USA 16 minutes ago

Why? Because it's pretty chilly!
58°F14°C & Clear

Wind is 1 mph2 km/h from the Northwest, gusting to 4 mph6 km/h
August 9
8am62°F17°C1 mph2 km/h NortheastClear
9am68°F20°C1 mph2 km/h NortheastClear
10am72°F22°C2 mph2 km/h NortheastClear
11am76°F24°C1 mph2 km/h NortheastClear
12pm79°F26°C2 mph3 km/h SoutheastClear
1pm81°F27°C3 mph4 km/h SouthClear
2pm82°F28°C3 mph5 km/h SoutheastClear
3pm83°F28°C3 mph4 km/h SoutheastClear
4pm83°F28°C3 mph5 km/h SoutheastClear
5pm83°F28°C4 mph6 km/h SoutheastClear
6pm82°F28°C4 mph7 km/h SouthClear
7pm79°F26°C5 mph8 km/h SouthClear
DateLowHighWindDayNight
August 956°F13°C83°F28°C2 mph4 km/h from SoutheastClearClear
August 1058°F15°C86°F30°C3 mph4 km/h from SouthwestClearClear
August 1161°F16°C87°F31°C3 mph5 km/h from SouthwestClearClear
August 1263°F17°C89°F32°C4 mph6 km/h from SouthwestClearClear
August 1369°F20°C90°F32°C6 mph9 km/h from SouthwestPartly CloudyPartly Cloudy
August 1472°F22°C88°F31°C5 mph8 km/h from NorthwestPartly CloudyMostly Clear
August 1570°F21°C87°F30°C5 mph8 km/h from SoutheastMostly ClearMostly Clear

Yes

Low of 58°F15°C, High of 86°F30°C
Wind: 3 mph4 km/h
Precipitation: None

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