Yes

you do need a jacket based on the weather in Washington, DC, USA 42 seconds ago

Why? Because you're not freezing, but you’ll definitely start complaining if it lasts much longer!
38°F4°C & Clear

Wind is 2 mph4 km/h from the Southwest, gusting to 4 mph6 km/h
March 11
8am39°F4°C3 mph5 km/h NorthwestClear
9am44°F7°C1 mph2 km/h NorthwestClear
10am51°F11°C2 mph3 km/h WestClear
11am57°F14°C3 mph4 km/h SouthwestClear
12pm62°F17°C3 mph5 km/h SouthwestClear
1pm66°F19°C4 mph6 km/h SouthwestClear
2pm67°F20°C5 mph7 km/h SouthwestClear
3pm69°F21°C6 mph9 km/h SouthwestClear
4pm70°F21°C7 mph11 km/h SouthwestClear
5pm70°F21°C8 mph12 km/h SouthwestClear
6pm68°F20°C7 mph12 km/h SouthwestClear
7pm64°F18°C6 mph10 km/h SouthClear
DateLowHighWindDayNight
March 1138°F4°C70°F21°C4 mph7 km/h from SouthwestClearMostly Clear
March 1246°F8°C65°F18°C7 mph11 km/h from EastMostly ClearPartly Cloudy
March 1342°F6°C60°F16°C6 mph9 km/h from EastMostly CloudyPartly Cloudy
March 1442°F6°C62°F16°C6 mph9 km/h from EastPartly CloudyMostly Cloudy
March 1545°F7°C66°F19°C7 mph12 km/h from SoutheastCloudyCloudy
March 1660°F16°C74°F23°C16 mph25 km/h from SouthRainRain
March 1745°F7°C61°F16°C11 mph17 km/h from NorthwestPartly CloudyClear

Yes

Low of 46°F8°C, High of 64°F18°C
Wind: 7 mph11 km/h
Precipitation: None

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