Yes

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

Why? Because it's pretty chilly.
51°F11°C & Cloudy

Wind is 11 mph17 km/h from the NW, gusting to 21 mph34 km/h
March 28
3pm52°F11°C10 mph16 km/h NWCloudy
4pm53°F11°C10 mph17 km/h NCloudy
5pm53°F12°C9 mph15 km/h NCloudy
6pm52°F11°C8 mph13 km/h NCloudy
7pm50°F10°C8 mph12 km/h NWMostly Cloudy
8pm48°F9°C7 mph11 km/h NWMostly Cloudy
9pm47°F8°C8 mph13 km/h NWPartly Cloudy
10pm45°F7°C9 mph15 km/h NWMostly Clear
11pm43°F6°C10 mph16 km/h NWClear
March 29
12am43°F6°C10 mph17 km/h NWClear
1am41°F5°C10 mph16 km/h NWClear
2am40°F5°C9 mph14 km/h NWClear
DateLowHighWindDayNight
March 2843°F6°C53°F12°C7 mph12 km/h from NWCloudyMostly Clear
March 2936°F2°C61°F16°C11 mph18 km/h from NWMostly ClearMostly Clear
March 3038°F4°C62°F16°C5 mph9 km/h from SMostly CloudyPartly Cloudy
March 3149°F10°C68°F20°C6 mph10 km/h from NWMostly CloudyRain
April 145°F7°C52°F11°C7 mph11 km/h from ERainRain
April 244°F7°C64°F18°C5 mph8 km/h from SRainDrizzle
April 342°F5°C58°F15°C11 mph18 km/h from WMostly CloudyMostly Clear

Yes

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

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