Yes

you do need a jacket based on the weather in 170 Zynn Rd, Downingtown, PA 19335, USA 1 second ago

Why? Because it's quite chilly!
50°F10°C & Mostly Clear

Wind is 7 mph12 km/h from the Northwest, gusting to 16 mph25 km/h
May 25
2am49°F9°C7 mph12 km/h WestClear
3am48°F9°C8 mph13 km/h WestClear
4am47°F9°C8 mph13 km/h WestClear
5am47°F8°C9 mph14 km/h WestClear
6am47°F8°C9 mph14 km/h WestMostly Clear
7am49°F10°C9 mph15 km/h WestMostly Clear
8am52°F11°C9 mph15 km/h NorthwestPartly Cloudy
9am55°F13°C10 mph16 km/h NorthwestPartly Cloudy
10am57°F14°C11 mph17 km/h NorthwestMostly Cloudy
11am60°F15°C11 mph17 km/h NorthwestPartly Cloudy
12pm62°F17°C11 mph17 km/h NorthwestPartly Cloudy
1pm63°F17°C11 mph18 km/h NorthwestMostly Cloudy
DateLowHighWindDayNight
May 2547°F8°C65°F19°C10 mph16 km/h from NorthwestMostly CloudyMostly Clear
May 2646°F8°C69°F20°C6 mph10 km/h from NorthMostly ClearPartly Cloudy
May 2749°F10°C70°F21°C5 mph8 km/h from SoutheastCloudyDrizzle
May 2853°F11°C62°F17°C7 mph12 km/h from SoutheastRainDrizzle
May 2957°F14°C73°F23°C6 mph10 km/h from SouthwestRainPartly Cloudy
May 3057°F14°C72°F22°C7 mph11 km/h from WestPartly CloudyMostly Cloudy
May 3154°F12°C71°F22°C6 mph10 km/h from WestDrizzleMostly Clear

Yes

Low of 46°F8°C, High of 69°F21°C
Wind: 6 mph10 km/h
Precipitation: None

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