Yes

you do need a jacket based on the weather in Vienna, VA 22180, USA 5 seconds ago

Why? Because there are thunderstorms out there!
89°F32°C & Thunderstorms

Wind is 9 mph15 km/h from the Southwest, gusting to 16 mph26 km/h
July 1
3pm89°F32°C10 mph16 km/h SouthwestThunderstorms
4pm87°F31°C10 mph17 km/h SouthwestThunderstorms
5pm85°F30°C10 mph16 km/h SouthwestThunderstorms
6pm79°F26°C9 mph14 km/h NorthwestThunderstorms
7pm78°F26°C7 mph11 km/h NorthwestThunderstorms
8pm77°F25°C6 mph10 km/h NorthThunderstorms
9pm76°F24°C6 mph9 km/h NorthwestThunderstorms
10pm75°F24°C3 mph5 km/h SouthwestThunderstorms
11pm75°F24°C3 mph5 km/h SouthwestThunderstorms
July 2
12am74°F23°C3 mph5 km/h SouthwestDrizzle
1am73°F23°C3 mph5 km/h SouthwestDrizzle
2am72°F22°C3 mph5 km/h SouthwestDrizzle
DateLowHighWindDayNight
July 174°F23°C91°F33°C6 mph10 km/h from SouthwestThunderstormsThunderstorms
July 271°F21°C84°F29°C2 mph4 km/h from NorthRainMostly Clear
July 369°F21°C87°F31°C6 mph9 km/h from NorthwestMostly ClearClear
July 467°F20°C85°F30°C5 mph8 km/h from NorthClearMostly Clear
July 566°F19°C88°F31°C3 mph5 km/h from SouthwestMostly ClearMostly Clear
July 668°F20°C90°F32°C6 mph10 km/h from SouthMostly ClearMostly Clear
July 770°F21°C89°F32°C5 mph8 km/h from SouthwestPartly CloudyPartly Cloudy

No

Low of 71°F22°C, High of 84°F29°C
Wind: 2 mph4 km/h
Precipitation: 75% rain

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