Yes

you do need a jacket based on the weather in Washington, DC, USA 3 minutes ago

Why? Because it's on the windy side!
77°F25°C & Cloudy

Wind is 8 mph13 km/h from the South, gusting to 20 mph32 km/h
May 3
8pm75°F24°C6 mph10 km/h SouthCloudy
9pm73°F23°C5 mph8 km/h SouthCloudy
10pm72°F22°C4 mph7 km/h SouthCloudy
11pm70°F21°C2 mph4 km/h SouthThunderstorms
May 4
12am69°F21°C6 mph9 km/h NortheastThunderstorms
1am68°F20°C4 mph7 km/h NortheastDrizzle
2am66°F19°C4 mph7 km/h SoutheastCloudy
3am66°F19°C4 mph7 km/h SouthDrizzle
4am65°F18°C5 mph9 km/h SouthDrizzle
5am65°F18°C5 mph8 km/h SouthCloudy
6am64°F18°C5 mph9 km/h SouthDrizzle
7am64°F18°C6 mph10 km/h SouthRain
DateLowHighWindDayNight
May 368°F20°C84°F29°C7 mph11 km/h from SouthPartly CloudyThunderstorms
May 464°F18°C73°F23°C9 mph14 km/h from SouthRainRain
May 563°F17°C78°F26°C7 mph11 km/h from SoutheastDrizzleRain
May 661°F16°C73°F23°C7 mph11 km/h from SouthwestPartly CloudyPartly Cloudy
May 758°F14°C76°F25°C7 mph11 km/h from WestPartly CloudyCloudy
May 859°F15°C73°F23°C5 mph8 km/h from NorthMostly CloudyPartly Cloudy
May 951°F10°C68°F20°C7 mph11 km/h from NortheastMostly ClearPartly Cloudy

No

Low of 64°F18°C, High of 73°F23°C
Wind: 9 mph14 km/h
Precipitation: 86% rain

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