Yes

you do need a jacket based on the weather in Hummelstown, PA 17036, USA 1 second ago

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

Wind is 6 mph10 km/h from the Southeast, gusting to 11 mph17 km/h
March 14
3pm56°F14°C7 mph11 km/h SoutheastPartly Cloudy
4pm57°F14°C8 mph12 km/h SoutheastMostly Cloudy
5pm57°F14°C9 mph14 km/h SoutheastMostly Cloudy
6pm56°F14°C8 mph13 km/h SoutheastMostly Cloudy
7pm54°F12°C7 mph11 km/h SoutheastMostly Cloudy
8pm51°F11°C6 mph10 km/h SoutheastCloudy
9pm49°F10°C5 mph9 km/h SoutheastMostly Cloudy
10pm48°F9°C5 mph9 km/h SoutheastMostly Cloudy
11pm46°F8°C6 mph9 km/h SoutheastPartly Cloudy
March 15
12am45°F7°C6 mph9 km/h SoutheastMostly Cloudy
1am44°F6°C6 mph9 km/h SoutheastCloudy
2am43°F6°C6 mph9 km/h SoutheastCloudy
DateLowHighWindDayNight
March 1434°F1°C57°F14°C5 mph8 km/h from SoutheastMostly CloudyMostly Cloudy
March 1542°F5°C58°F15°C10 mph16 km/h from SoutheastCloudyMostly Cloudy
March 1653°F11°C66°F19°C17 mph27 km/h from SouthRainHeavy Rain
March 1739°F4°C56°F14°C11 mph18 km/h from NorthwestMostly CloudyMostly Clear
March 1834°F1°C64°F18°C6 mph9 km/h from WestClearClear
March 1941°F5°C67°F20°C7 mph11 km/h from SoutheastPartly CloudyMostly Cloudy
March 2041°F5°C61°F16°C14 mph23 km/h from SouthRainDrizzle

Yes

Low of 42°F6°C, High of 58°F15°C
Wind: 10 mph16 km/h
Precipitation: None

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