Yes

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

Why? Because it's bitterly cold.
39°F4°C & Mostly Cloudy

Wind is 4 mph6 km/h from the SE, gusting to 6 mph10 km/h
March 28
11am41°F5°C4 mph7 km/h SEMostly Cloudy
12pm44°F7°C4 mph7 km/h SMostly Cloudy
1pm48°F9°C6 mph10 km/h SMostly Cloudy
2pm52°F11°C9 mph14 km/h SMostly Cloudy
3pm54°F12°C12 mph19 km/h SWMostly Cloudy
4pm55°F13°C14 mph22 km/h SWCloudy
5pm57°F14°C14 mph23 km/h SWMostly Cloudy
6pm58°F14°C14 mph22 km/h SWCloudy
7pm57°F14°C13 mph21 km/h SWCloudy
8pm56°F14°C13 mph21 km/h SWMostly Cloudy
9pm56°F13°C11 mph18 km/h SWCloudy
10pm53°F12°C10 mph16 km/h SWCloudy
DateLowHighWindDayNight
March 2839°F4°C58°F14°C10 mph16 km/h from SWMostly CloudyMostly Cloudy
March 2937°F3°C60°F15°C3 mph4 km/h from SPartly CloudyMostly Clear
March 3037°F3°C63°F17°C7 mph11 km/h from NClearMostly Clear
March 3138°F3°C67°F19°C8 mph13 km/h from NClearMostly Clear
April 139°F4°C74°F23°C2 mph4 km/h from SEMostly ClearMostly Clear
April 245°F7°C81°F27°C5 mph8 km/h from SClearMostly Cloudy
April 348°F9°C71°F21°C10 mph16 km/h from WMostly CloudyPartly Cloudy

Yes

Low of 37°F3°C, High of 60°F16°C
Wind: 3 mph4 km/h
Precipitation: None

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