Yes

you do need a jacket based on the weather in Washington (Southwest Washington), District of Columbia, United States 1 second ago

Why? Because it's not very warm out!
58°F14°C & Cloudy

Wind is 4 mph6 km/h from the Northwest, gusting to 9 mph15 km/h
May 29
4am58°F14°C4 mph6 km/h NorthwestCloudy
5am58°F14°C2 mph3 km/h NorthwestCloudy
6am57°F14°C3 mph5 km/h NorthwestCloudy
7am58°F14°C3 mph4 km/h NorthwestCloudy
8am59°F15°C3 mph5 km/h NorthwestCloudy
9am62°F16°C3 mph5 km/h NorthwestCloudy
10am64°F18°C3 mph5 km/h NorthwestCloudy
11am67°F19°C4 mph6 km/h WestCloudy
12pm69°F21°C4 mph7 km/h WestCloudy
1pm72°F22°C4 mph7 km/h WestCloudy
2pm74°F23°C4 mph7 km/h WestCloudy
3pm76°F24°C4 mph7 km/h SouthwestCloudy
DateLowHighWindDayNight
May 2957°F14°C76°F24°C4 mph6 km/h from WestCloudyRain
May 3061°F16°C77°F25°C3 mph5 km/h from SouthwestRainThunderstorms
May 3155°F13°C69°F21°C9 mph15 km/h from WestRainMostly Clear
June 151°F10°C70°F21°C9 mph15 km/h from WestPartly CloudyPartly Cloudy
June 255°F13°C74°F23°C4 mph7 km/h from WestPartly CloudyPartly Cloudy
June 358°F14°C80°F27°C3 mph5 km/h from NorthPartly CloudyPartly Cloudy
June 462°F17°C84°F29°C6 mph9 km/h from SouthMostly ClearPartly Cloudy

No

Low of 62°F17°C, High of 77°F25°C
Wind: 3 mph5 km/h
Precipitation: 53% rain

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