Yes

you do need a jacket based on the weather in Hagerstown, MD, USA 1 second ago

Why? Because you're not freezing, but you’ll definitely start complaining if it lasts much longer!
50°F10°C & Mostly Clear

Wind is 4 mph7 km/h from the Northwest, gusting to 11 mph18 km/h
May 25
1am49°F10°C5 mph7 km/h NorthwestMostly Clear
2am48°F9°C4 mph7 km/h NorthwestPartly Cloudy
3am47°F8°C4 mph7 km/h WestMostly Clear
4am46°F8°C4 mph7 km/h WestPartly Cloudy
5am45°F7°C4 mph7 km/h WestMostly Clear
6am46°F8°C4 mph6 km/h WestMostly Cloudy
7am48°F9°C4 mph7 km/h NorthwestMostly Cloudy
8am52°F11°C6 mph9 km/h NorthwestMostly Cloudy
9am55°F13°C8 mph13 km/h NorthwestPartly Cloudy
10am58°F15°C9 mph15 km/h NorthwestPartly Cloudy
11am61°F16°C10 mph16 km/h NorthwestPartly Cloudy
12pm63°F17°C10 mph16 km/h NorthwestPartly Cloudy
DateLowHighWindDayNight
May 2545°F7°C66°F19°C9 mph14 km/h from NorthwestMostly CloudyPartly Cloudy
May 2644°F7°C69°F21°C5 mph8 km/h from NorthPartly CloudyPartly Cloudy
May 2748°F9°C69°F20°C6 mph10 km/h from SoutheastDrizzleRain
May 2853°F12°C64°F18°C10 mph15 km/h from SoutheastRainDrizzle
May 2959°F15°C76°F24°C7 mph11 km/h from SouthwestDrizzlePartly Cloudy
May 3056°F13°C74°F23°C7 mph11 km/h from WestPartly CloudyMostly Cloudy
May 3155°F13°C72°F22°C6 mph10 km/h from NorthwestDrizzleMostly Clear

Yes

Low of 45°F7°C, High of 70°F21°C
Wind: 5 mph8 km/h
Precipitation: None

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