Yes

you do need a jacket based on the weather in Pittsburgh, PA 15228, USA 1 second ago

Why? Because it's cold. simple as that.
39°F4°C & Clear

Wind is 4 mph7 km/h from the E, gusting to 13 mph21 km/h
April 26
6am39°F4°C5 mph8 km/h EMostly Clear
7am40°F5°C5 mph8 km/h EMostly Clear
8am45°F7°C6 mph10 km/h EMostly Clear
9am50°F10°C7 mph11 km/h SEMostly Clear
10am55°F13°C8 mph13 km/h SEMostly Clear
11am59°F15°C9 mph15 km/h SEMostly Clear
12pm63°F17°C9 mph15 km/h SEMostly Clear
1pm66°F19°C9 mph14 km/h SEMostly Clear
2pm68°F20°C9 mph14 km/h SEPartly Cloudy
3pm69°F21°C10 mph15 km/h SEPartly Cloudy
4pm70°F21°C10 mph16 km/h SEMostly Clear
5pm70°F21°C10 mph16 km/h SEMostly Clear
DateLowHighWindDayNight
April 2638°F4°C70°F21°C9 mph14 km/h from SEMostly ClearRain
April 2749°F9°C70°F21°C8 mph13 km/h from SERainPartly Cloudy
April 2856°F13°C81°F27°C7 mph12 km/h from SWPartly CloudyMostly Clear
April 2958°F14°C83°F28°C6 mph10 km/h from SWPartly CloudyPartly Cloudy
April 3060°F16°C73°F23°C7 mph11 km/h from SWDrizzlePartly Cloudy
May 155°F13°C78°F25°C6 mph9 km/h from SWMostly CloudyMostly Cloudy
May 257°F14°C80°F27°C6 mph10 km/h from SWDrizzleDrizzle

Yes

Low of 49°F10°C, High of 70°F21°C
Wind: 8 mph13 km/h
Precipitation: 59% rain

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