Yes

you do need a jacket based on the weather in Philadelphia (Olney-Oak Lane), Pennsylvania, United States 1 second ago

Why? Because it's quite chilly.
42°F5°C & Mostly Cloudy

Wind is 9 mph15 km/h from the NW, gusting to 22 mph36 km/h
March 29
3am41°F5°C10 mph15 km/h NWMostly Cloudy
4am39°F4°C9 mph14 km/h NWMostly Cloudy
5am38°F3°C9 mph14 km/h NWClear
6am37°F3°C9 mph15 km/h NWClear
7am36°F2°C9 mph15 km/h NWClear
8am37°F3°C9 mph15 km/h NWClear
9am41°F5°C10 mph17 km/h NWClear
10am44°F7°C11 mph18 km/h NWClear
11am47°F9°C12 mph19 km/h NWClear
12pm50°F10°C13 mph21 km/h NWClear
1pm52°F11°C14 mph22 km/h NWMostly Clear
2pm53°F12°C14 mph23 km/h NWMostly Clear
DateLowHighWindDayNight
March 2936°F2°C55°F13°C13 mph20 km/h from NWMostly ClearClear
March 3036°F2°C59°F15°C9 mph14 km/h from WPartly CloudyMostly Cloudy
March 3148°F9°C61°F16°C8 mph13 km/h from NWMostly CloudyCloudy
April 143°F6°C50°F10°C7 mph12 km/h from ERainRain
April 242°F6°C49°F9°C9 mph14 km/h from ERainRain
April 341°F5°C50°F10°C10 mph16 km/h from NRainMostly Cloudy
April 438°F4°C49°F10°C17 mph27 km/h from NWWindyPartly Cloudy

Yes

Low of 36°F2°C, High of 59°F15°C
Wind: 9 mph14 km/h
Precipitation: None

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