Yes

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

Why? Because some drizzle out there!
64°F18°C & Drizzle

Wind is 6 mph9 km/h from the Southeast, gusting to 12 mph20 km/h
May 13
9am65°F18°C6 mph10 km/h SoutheastRain
10am66°F19°C7 mph12 km/h SoutheastDrizzle
11am67°F20°C8 mph13 km/h SoutheastDrizzle
12pm68°F20°C9 mph14 km/h SoutheastRain
1pm69°F20°C11 mph17 km/h SoutheastDrizzle
2pm68°F20°C11 mph17 km/h SoutheastRain
3pm67°F20°C10 mph16 km/h SoutheastRain
4pm67°F19°C11 mph18 km/h SoutheastDrizzle
5pm66°F19°C11 mph18 km/h SoutheastRain
6pm66°F19°C12 mph19 km/h SoutheastRain
7pm65°F18°C11 mph18 km/h EastRain
8pm64°F18°C12 mph19 km/h EastRain
DateLowHighWindDayNight
May 1360°F16°C69°F20°C9 mph15 km/h from SoutheastRainRain
May 1459°F15°C67°F20°C10 mph17 km/h from EastRainRain
May 1561°F16°C72°F22°C4 mph6 km/h from SoutheastRainPartly Cloudy
May 1660°F16°C78°F25°C5 mph9 km/h from SouthwestDrizzleDrizzle
May 1763°F17°C76°F24°C6 mph9 km/h from SouthwestDrizzleDrizzle
May 1861°F16°C81°F27°C10 mph16 km/h from WestPartly CloudyPartly Cloudy
May 1957°F14°C75°F24°C9 mph15 km/h from NorthwestPartly CloudyMostly Clear

No

Low of 59°F15°C, High of 67°F20°C
Wind: 10 mph17 km/h
Precipitation: 82% rain

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