Yes

you do need a jacket based on the weather in Herndon, VA 20170, USA 1 second ago

Why? Because it's cold. simple as that.
48°F9°C & Cloudy

Wind is 6 mph10 km/h from the NW, gusting to 17 mph27 km/h
March 28
8pm48°F9°C7 mph11 km/h NWMostly Cloudy
9pm47°F8°C8 mph13 km/h NWPartly Cloudy
10pm45°F7°C9 mph14 km/h NWMostly Clear
11pm44°F6°C9 mph14 km/h NWMostly Clear
March 29
12am42°F6°C9 mph14 km/h NWMostly Clear
1am41°F5°C8 mph13 km/h NWClear
2am39°F4°C7 mph12 km/h NWClear
3am38°F3°C6 mph10 km/h NWClear
4am37°F3°C6 mph9 km/h NWClear
5am36°F2°C5 mph8 km/h NWMostly Clear
6am36°F2°C5 mph8 km/h WPartly Cloudy
7am36°F2°C5 mph8 km/h WPartly Cloudy
DateLowHighWindDayNight
March 2842°F6°C53°F11°C5 mph8 km/h from NCloudyMostly Clear
March 2936°F2°C60°F16°C11 mph18 km/h from NWMostly ClearClear
March 3038°F3°C63°F17°C6 mph9 km/h from SMostly CloudyMostly Cloudy
March 3149°F10°C67°F20°C5 mph8 km/h from NWMostly CloudyDrizzle
April 147°F8°C56°F13°C5 mph8 km/h from ERainRain
April 246°F8°C61°F16°C6 mph10 km/h from SERainRain
April 342°F6°C56°F13°C11 mph18 km/h from NWRainPartly Cloudy

Yes

Low of 36°F2°C, High of 61°F16°C
Wind: 11 mph18 km/h
Precipitation: None

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