Yes

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

Why? Because it's cool. Pleasantly cool, but cool!
51°F11°C & Cloudy

Wind is 4 mph6 km/h from the North, gusting to 7 mph11 km/h
October 26
3pm52°F11°C4 mph6 km/h NorthCloudy
4pm56°F13°C4 mph6 km/h NorthCloudy
5pm59°F15°C3 mph5 km/h NortheastPartly Cloudy
6pm60°F16°C3 mph5 km/h NortheastMostly Clear
7pm61°F16°C3 mph4 km/h NortheastMostly Cloudy
8pm61°F16°C3 mph4 km/h NortheastPartly Cloudy
9pm60°F15°C3 mph5 km/h NortheastMostly Clear
10pm56°F13°C3 mph5 km/h NortheastMostly Clear
11pm51°F11°C2 mph4 km/h NortheastMostly Clear
October 27
12am48°F9°C3 mph4 km/h NortheastMostly Clear
1am46°F8°C2 mph4 km/h EastMostly Clear
2am45°F7°C2 mph3 km/h EastPartly Cloudy
DateLowHighWindDayNight
October 2636°F2°C61°F16°C3 mph4 km/h from NortheastPartly CloudyPartly Cloudy
October 2737°F3°C60°F16°C6 mph9 km/h from EastMostly ClearMostly Cloudy
October 2838°F3°C57°F14°C9 mph15 km/h from NortheastMostly CloudyMostly Cloudy
October 2941°F5°C58°F14°C8 mph12 km/h from NortheastMostly CloudyRain
October 3048°F9°C60°F15°C12 mph19 km/h from EastThunderstormsRain
October 3146°F8°C60°F16°C10 mph17 km/h from WestRainMostly Clear
November 142°F6°C59°F15°C8 mph12 km/h from WestPartly CloudyPartly Cloudy

Yes

Low of 37°F3°C, High of 61°F16°C
Wind: 6 mph9 km/h
Precipitation: None

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