Yes

you do need a jacket based on the weather in 88930 Lentiira, Finland 1 second ago

Why? Because the drizzle is not enough rain to call it "raining," but enough to make you a little soggy and a jacket will keep you cozy, but you won't break a seat and it's fairly windy outside!
54°F12°C & Drizzle

Wind is 9 mph14 km/h from the South, gusting to 21 mph33 km/h
September 15
6pm55°F13°C9 mph14 km/h SouthDrizzle
7pm55°F13°C8 mph13 km/h SouthCloudy
8pm54°F12°C8 mph13 km/h SouthCloudy
9pm54°F12°C8 mph13 km/h SouthCloudy
10pm54°F12°C8 mph13 km/h SouthCloudy
11pm53°F12°C8 mph13 km/h SouthCloudy
September 16
12am53°F12°C8 mph13 km/h SouthMostly Cloudy
1am53°F12°C8 mph13 km/h SouthMostly Cloudy
2am53°F12°C9 mph15 km/h SouthMostly Cloudy
3am55°F13°C9 mph15 km/h SouthMostly Cloudy
4am56°F13°C9 mph15 km/h SouthMostly Cloudy
5am57°F14°C9 mph14 km/h SouthMostly Cloudy
DateLowHighWindDayNight
September 1553°F12°C60°F15°C9 mph15 km/h from SouthDrizzleDrizzle
September 1653°F12°C58°F14°C8 mph13 km/h from SouthDrizzleDrizzle
September 1750°F10°C57°F14°C8 mph12 km/h from SouthwestDrizzleDrizzle
September 1847°F9°C54°F12°C5 mph8 km/h from WestDrizzleDrizzle
September 1944°F6°C52°F11°C7 mph11 km/h from WestRainMostly Cloudy
September 2044°F7°C50°F10°C7 mph11 km/h from WestDrizzleRain
September 2136°F2°C46°F8°C8 mph13 km/h from NorthwestRainPartly Cloudy

Yes

Low of 53°F12°C, High of 58°F15°C
Wind: 8 mph13 km/h
Precipitation: 59% rain

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