Yes

you do need a jacket based on the weather in Washington, DC, USA 16 minutes ago

Why? Because it's cool enough your breath is visible, but your nose isn’t red yet!
46°F8°C & Clear

Wind is 4 mph7 km/h from the Northeast, gusting to 10 mph16 km/h
October 10
6am46°F8°C5 mph8 km/h NortheastClear
7am46°F8°C5 mph8 km/h NortheastClear
8am47°F8°C6 mph9 km/h NortheastClear
9am51°F11°C6 mph9 km/h NortheastClear
10am56°F13°C6 mph10 km/h EastClear
11am59°F15°C7 mph11 km/h EastMostly Clear
12pm62°F17°C8 mph13 km/h EastMostly Clear
1pm64°F18°C8 mph12 km/h SoutheastPartly Cloudy
2pm65°F18°C7 mph12 km/h SoutheastMostly Cloudy
3pm65°F18°C7 mph12 km/h SoutheastMostly Cloudy
4pm65°F19°C8 mph13 km/h SoutheastPartly Cloudy
5pm64°F18°C7 mph12 km/h SoutheastMostly Cloudy
DateLowHighWindDayNight
October 1046°F8°C65°F19°C7 mph11 km/h from EastPartly CloudyMostly Cloudy
October 1153°F12°C70°F21°C6 mph9 km/h from NortheastDrizzleDrizzle
October 1260°F16°C67°F20°C12 mph19 km/h from NortheastDrizzleDrizzle
October 1356°F14°C66°F19°C11 mph18 km/h from NorthDrizzleDrizzle
October 1456°F14°C68°F20°C10 mph16 km/h from NorthDrizzlePartly Cloudy
October 1556°F13°C69°F20°C9 mph14 km/h from NorthwestMostly ClearPartly Cloudy
October 1649°F9°C61°F16°C11 mph18 km/h from NorthwestMostly ClearClear

Yes

Low of 53°F12°C, High of 70°F21°C
Wind: 6 mph9 km/h
Precipitation: 42% rain

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