Yes

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

Why? Because it's not very warm out.
52°F11°C & Partly Cloudy

Wind is 12 mph20 km/h from the SW, gusting to 30 mph49 km/h
April 13
12am52°F11°C13 mph21 km/h SWMostly Cloudy
1am51°F11°C14 mph22 km/h SWMostly Cloudy
2am50°F10°C14 mph22 km/h WMostly Cloudy
3am48°F9°C15 mph23 km/h WCloudy
4am47°F8°C15 mph25 km/h WWindy
5am46°F8°C15 mph25 km/h WWindy
6am44°F7°C15 mph24 km/h WWindy
7am44°F7°C15 mph24 km/h WCloudy
8am44°F7°C16 mph25 km/h WWindy
9am45°F7°C16 mph26 km/h WWindy
10am46°F8°C17 mph27 km/h WWindy
11am47°F9°C18 mph29 km/h WWindy
DateLowHighWindDayNight
April 1252°F11°C64°F18°C7 mph11 km/h from WRainRain
April 1344°F7°C56°F13°C18 mph28 km/h from WWindyMostly Clear
April 1441°F5°C71°F22°C12 mph19 km/h from SWMostly ClearMostly Cloudy
April 1553°F12°C72°F22°C8 mph13 km/h from NWMostly ClearMostly Clear
April 1646°F8°C71°F22°C4 mph7 km/h from WMostly ClearPartly Cloudy
April 1750°F10°C70°F21°C7 mph11 km/h from SECloudyMostly Cloudy
April 1855°F13°C71°F22°C9 mph15 km/h from WPartly CloudyPartly Cloudy

Yes

Low of 44°F7°C, High of 55°F13°C
Wind: 18 mph28 km/h
Precipitation: None

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