Yes

you do need a jacket based on the weather in West Windsor Township (Princeton Junction), New Jersey, United States 1 second ago

Why? Because it's super windy outside!
64°F18°C & Cloudy

Wind is 12 mph20 km/h from the Northeast, gusting to 26 mph42 km/h
August 21
12pm65°F19°C13 mph20 km/h NortheastCloudy
1pm67°F20°C13 mph21 km/h NortheastCloudy
2pm70°F21°C14 mph23 km/h NortheastCloudy
3pm71°F22°C14 mph22 km/h NortheastCloudy
4pm72°F22°C13 mph21 km/h NortheastCloudy
5pm73°F23°C12 mph20 km/h NortheastMostly Cloudy
6pm72°F22°C11 mph18 km/h NortheastCloudy
7pm71°F22°C9 mph14 km/h NortheastPartly Cloudy
8pm70°F21°C8 mph13 km/h NorthPartly Cloudy
9pm68°F20°C8 mph12 km/h NortheastPartly Cloudy
10pm67°F19°C8 mph13 km/h NortheastMostly Clear
11pm65°F18°C8 mph13 km/h NortheastMostly Clear
DateLowHighWindDayNight
August 2159°F15°C73°F23°C11 mph18 km/h from NortheastDrizzleMostly Clear
August 2257°F14°C81°F27°C5 mph8 km/h from NorthClearClear
August 2361°F16°C82°F28°C8 mph13 km/h from SouthwestClearMostly Clear
August 2464°F18°C82°F28°C8 mph13 km/h from SouthPartly CloudyMostly Cloudy
August 2567°F19°C81°F27°C6 mph10 km/h from WestDrizzleClear
August 2660°F16°C76°F25°C9 mph14 km/h from WestMostly ClearClear
August 2760°F16°C75°F24°C7 mph12 km/h from NorthwestMostly ClearPartly Cloudy

Yes

Low of 57°F14°C, High of 81°F27°C
Wind: 5 mph8 km/h
Precipitation: None

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