Yes

you do need a jacket based on the weather in Vilnius, Lithuania 1 second ago

Why? Because it's drizzling and it's so windy, your hat will probably launch into orbit!
63°F17°C & Drizzle

Wind is 12 mph19 km/h from the West, gusting to 25 mph41 km/h
June 27
12pm63°F17°C12 mph19 km/h WestMostly Cloudy
1pm63°F17°C12 mph19 km/h WestCloudy
2pm61°F16°C12 mph19 km/h WestDrizzle
3pm60°F16°C11 mph18 km/h WestCloudy
4pm59°F15°C10 mph17 km/h WestDrizzle
5pm58°F15°C11 mph17 km/h WestDrizzle
6pm57°F14°C12 mph19 km/h WestRain
7pm56°F13°C12 mph19 km/h WestDrizzle
8pm55°F13°C11 mph18 km/h WestCloudy
9pm54°F12°C11 mph17 km/h WestCloudy
10pm54°F12°C11 mph17 km/h WestCloudy
11pm54°F12°C11 mph17 km/h WestPartly Cloudy
DateLowHighWindDayNight
June 2652°F11°C65°F18°C7 mph11 km/h from SouthwestRainRain
June 2754°F12°C69°F21°C15 mph25 km/h from NorthwestWindyPartly Cloudy
June 2853°F12°C70°F21°C15 mph25 km/h from WestWindyMostly Clear
June 2951°F11°C68°F20°C15 mph24 km/h from NorthwestMostly ClearMostly Clear
June 3051°F11°C72°F22°C12 mph19 km/h from NorthwestPartly CloudyMostly Clear
July 153°F12°C81°F27°C8 mph13 km/h from WestClearClear
July 260°F15°C82°F28°C7 mph12 km/h from SouthwestClearPartly Cloudy

Yes

Low of 54°F12°C, High of 70°F21°C
Wind: 15 mph25 km/h
Precipitation: 8% rain

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