Yes

you do need a jacket based on the weather in Mt Vernon, VA, USA 1 second ago

Why? Because it's cool. Pleasantly cool, but cool!
55°F13°C & Partly Cloudy

Wind is 6 mph10 km/h from the Northwest, gusting to 14 mph22 km/h
May 25
2am53°F12°C6 mph9 km/h NorthwestMostly Clear
3am52°F11°C6 mph9 km/h NorthwestMostly Clear
4am50°F10°C5 mph8 km/h NorthwestMostly Clear
5am50°F10°C5 mph8 km/h NorthwestMostly Clear
6am50°F10°C5 mph8 km/h NorthwestMostly Cloudy
7am53°F12°C5 mph8 km/h NorthwestPartly Cloudy
8am56°F13°C6 mph9 km/h NorthwestMostly Clear
9am59°F15°C7 mph11 km/h NorthwestMostly Clear
10am62°F17°C7 mph12 km/h NorthwestClear
11am65°F18°C8 mph12 km/h NorthwestClear
12pm67°F19°C8 mph13 km/h NorthwestMostly Clear
1pm69°F20°C9 mph14 km/h NorthwestMostly Clear
DateLowHighWindDayNight
May 2550°F10°C72°F22°C8 mph12 km/h from NorthwestPartly CloudyMostly Cloudy
May 2654°F12°C73°F23°C6 mph9 km/h from NorthPartly CloudyPartly Cloudy
May 2752°F11°C72°F22°C6 mph9 km/h from SoutheastDrizzleRain
May 2856°F14°C67°F20°C8 mph14 km/h from SoutheastRainDrizzle
May 2962°F17°C79°F26°C6 mph9 km/h from SouthwestRainMostly Cloudy
May 3062°F17°C77°F25°C6 mph10 km/h from WestMostly CloudyMostly Cloudy
May 3159°F15°C76°F24°C6 mph9 km/h from WestMostly CloudyPartly Cloudy

Yes

Low of 54°F12°C, High of 73°F23°C
Wind: 6 mph9 km/h
Precipitation: None

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