Yes

you do need a jacket based on the weather in Pittsburgh (Uptown), Pennsylvania, United States 12 seconds ago

Why? Because it's not very warm out!
55°F13°C & Cloudy

Wind is 1 mph2 km/h from the Northeast, gusting to 4 mph7 km/h
October 25
9pm55°F13°C2 mph3 km/h NortheastCloudy
10pm53°F11°C2 mph4 km/h NortheastCloudy
11pm50°F10°C3 mph5 km/h EastCloudy
October 26
12am48°F9°C2 mph4 km/h EastCloudy
1am47°F8°C2 mph4 km/h EastMostly Cloudy
2am45°F7°C2 mph4 km/h EastPartly Cloudy
3am43°F6°C2 mph3 km/h EastPartly Cloudy
4am42°F6°C2 mph3 km/h EastMostly Clear
5am41°F5°C2 mph3 km/h NortheastClear
6am39°F4°C2 mph3 km/h NortheastClear
7am39°F4°C2 mph3 km/h NortheastMostly Clear
8am38°F3°C2 mph3 km/h NortheastPartly Cloudy
DateLowHighWindDayNight
October 2537°F3°C56°F13°C1 mph2 km/h from NortheastMostly CloudyPartly Cloudy
October 2637°F3°C56°F13°C5 mph7 km/h from NortheastPartly CloudyMostly Clear
October 2738°F3°C58°F15°C7 mph11 km/h from EastMostly ClearMostly Clear
October 2837°F3°C55°F13°C8 mph13 km/h from EastMostly ClearMostly Clear
October 2939°F4°C55°F13°C9 mph14 km/h from EastDrizzleRain
October 3044°F6°C50°F10°C10 mph17 km/h from EastRainRain
October 3143°F6°C50°F10°C13 mph20 km/h from WestDrizzleMostly Cloudy

Yes

Low of 37°F3°C, High of 56°F14°C
Wind: 5 mph7 km/h
Precipitation: None

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