Yes

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

Why? Because just cool enough for a jacket, but not warm enough to ditch it!
50°F10°C & Mostly Clear

Wind is 5 mph8 km/h from the Northwest, gusting to 11 mph18 km/h
April 28
4am49°F10°C5 mph8 km/h NorthwestClear
5am48°F9°C4 mph7 km/h NorthwestClear
6am48°F9°C4 mph7 km/h WestClear
7am49°F9°C4 mph6 km/h WestClear
8am53°F12°C5 mph8 km/h NorthwestClear
9am58°F14°C5 mph8 km/h NorthwestClear
10am62°F17°C4 mph7 km/h NorthClear
11am66°F19°C3 mph5 km/h NorthClear
12pm69°F21°C2 mph4 km/h NorthwestClear
1pm72°F22°C2 mph4 km/h WestClear
2pm73°F23°C3 mph4 km/h WestClear
3pm74°F23°C4 mph6 km/h SouthwestClear
DateLowHighWindDayNight
April 2848°F9°C75°F24°C4 mph7 km/h from WestClearMostly Clear
April 2950°F10°C80°F27°C12 mph20 km/h from SouthwestPartly CloudyMostly Cloudy
April 3061°F16°C80°F27°C9 mph15 km/h from NorthwestPartly CloudyPartly Cloudy
May 155°F13°C76°F24°C8 mph13 km/h from SoutheastMostly CloudyDrizzle
May 260°F16°C83°F28°C13 mph20 km/h from SouthwestMostly CloudyMostly Cloudy
May 352°F11°C67°F19°C11 mph18 km/h from NorthwestMostly ClearMostly Clear
May 446°F8°C70°F21°C7 mph11 km/h from WestMostly ClearClear

Yes

Low of 50°F10°C, High of 80°F27°C
Wind: 12 mph20 km/h
Precipitation: None

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