Yes

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

Why? Because it's so windy, you’re practically horizontal just trying to walk!
66°F19°C & Cloudy

Wind is 11 mph18 km/h from the Southwest, gusting to 27 mph43 km/h
September 4
11am67°F19°C11 mph18 km/h SouthwestDrizzle
12pm68°F20°C12 mph19 km/h SouthwestCloudy
1pm69°F21°C12 mph20 km/h SouthwestDrizzle
2pm70°F21°C11 mph18 km/h SouthwestRain
3pm68°F20°C9 mph15 km/h SouthwestDrizzle
4pm68°F20°C8 mph13 km/h WestDrizzle
5pm67°F19°C8 mph12 km/h WestRain
6pm66°F19°C6 mph10 km/h WestDrizzle
7pm66°F19°C6 mph9 km/h SouthwestPartly Cloudy
8pm64°F18°C4 mph7 km/h SouthwestPartly Cloudy
9pm63°F17°C4 mph6 km/h SouthwestPartly Cloudy
10pm62°F17°C3 mph5 km/h SouthwestPartly Cloudy
DateLowHighWindDayNight
September 460°F16°C70°F21°C9 mph14 km/h from SouthwestRainDrizzle
September 558°F15°C79°F26°C10 mph16 km/h from SouthwestPartly CloudyThunderstorms
September 655°F13°C67°F20°C4 mph6 km/h from NorthwestRainPartly Cloudy
September 751°F10°C66°F19°C7 mph11 km/h from WestPartly CloudyMostly Clear
September 846°F8°C68°F20°C3 mph5 km/h from WestMostly ClearClear
September 947°F8°C71°F22°C4 mph6 km/h from EastMostly ClearMostly Clear
September 1053°F12°C74°F23°C3 mph4 km/h from SouthMostly ClearMostly Clear

Yes

Low of 58°F15°C, High of 79°F26°C
Wind: 10 mph16 km/h
Precipitation: 42% rain

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