Yes

you do need a jacket based on the weather in Philadelphia, PA 19104, USA 1 second ago

Why? Because it's cold. simple as that.
48°F9°C & Drizzle

Wind is 4 mph7 km/h from the N, gusting to 10 mph16 km/h
March 28
10am49°F9°C5 mph8 km/h NDrizzle
11am50°F10°C6 mph9 km/h NWDrizzle
12pm51°F11°C7 mph12 km/h NDrizzle
1pm52°F11°C8 mph13 km/h NDrizzle
2pm52°F11°C9 mph14 km/h NDrizzle
3pm52°F11°C9 mph14 km/h NDrizzle
4pm51°F11°C8 mph13 km/h NWDrizzle
5pm50°F10°C8 mph13 km/h NDrizzle
6pm49°F10°C7 mph11 km/h NWDrizzle
7pm48°F9°C7 mph11 km/h NWCloudy
8pm47°F8°C6 mph10 km/h NWCloudy
9pm47°F8°C8 mph12 km/h NWCloudy
DateLowHighWindDayNight
March 2844°F7°C52°F11°C7 mph11 km/h from NDrizzlePartly Cloudy
March 2936°F2°C56°F14°C12 mph20 km/h from NWClearClear
March 3036°F2°C60°F15°C8 mph13 km/h from WMostly CloudyMostly Cloudy
March 3146°F8°C61°F16°C9 mph14 km/h from NWMostly CloudyMostly Cloudy
April 140°F4°C49°F10°C6 mph10 km/h from ECloudyRain
April 241°F5°C49°F9°C6 mph10 km/h from ERainCloudy
April 341°F5°C49°F10°C9 mph14 km/h from NWMostly CloudyRain

Yes

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

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