Yes

you do need a jacket based on the weather in Philadelphia, PA, USA 1 second ago

Why? Because it's quite chilly.
47°F8°C & Cloudy

Wind is 3 mph5 km/h from the N, gusting to 7 mph11 km/h
March 28
8am47°F8°C3 mph5 km/h NDrizzle
9am48°F9°C4 mph6 km/h NDrizzle
10am49°F9°C5 mph8 km/h NDrizzle
11am50°F10°C6 mph9 km/h NDrizzle
12pm51°F11°C6 mph10 km/h NDrizzle
1pm52°F11°C7 mph12 km/h NDrizzle
2pm52°F11°C8 mph13 km/h NDrizzle
3pm51°F11°C8 mph13 km/h NDrizzle
4pm51°F11°C8 mph13 km/h NDrizzle
5pm50°F10°C8 mph12 km/h NDrizzle
6pm49°F10°C7 mph11 km/h NDrizzle
7pm48°F9°C6 mph10 km/h NWDrizzle
DateLowHighWindDayNight
March 2844°F7°C52°F11°C6 mph10 km/h from NDrizzleDrizzle
March 2936°F2°C56°F13°C12 mph20 km/h from NWClearClear
March 3036°F2°C60°F16°C8 mph13 km/h from WMostly CloudyMostly Cloudy
March 3147°F8°C62°F17°C9 mph14 km/h from NWMostly CloudyMostly Cloudy
April 140°F5°C50°F10°C7 mph11 km/h from ECloudyRain
April 243°F6°C52°F11°C6 mph10 km/h from NERainDrizzle
April 342°F5°C52°F11°C10 mph16 km/h from NWMostly CloudyMostly Clear

Yes

Low of 37°F3°C, High of 56°F14°C
Wind: 12 mph20 km/h
Precipitation: None

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