Yes

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

Why? Because it's not very warm out.
52°F11°C & Cloudy

Wind is 9 mph14 km/h from the SE, gusting to 18 mph29 km/h
March 28
10am51°F11°C9 mph14 km/h SEMostly Cloudy
11am50°F10°C8 mph13 km/h SEMostly Cloudy
12pm48°F9°C8 mph13 km/h SEMostly Cloudy
1pm45°F7°C8 mph13 km/h SECloudy
2pm44°F7°C8 mph13 km/h SECloudy
3pm43°F6°C8 mph13 km/h ECloudy
4pm42°F6°C8 mph12 km/h ECloudy
5pm42°F5°C7 mph12 km/h ECloudy
6pm41°F5°C8 mph12 km/h ECloudy
7pm40°F4°C8 mph13 km/h ECloudy
8pm39°F4°C8 mph13 km/h ECloudy
9pm39°F4°C8 mph13 km/h ECloudy
DateLowHighWindDayNight
March 2734°F1°C52°F11°C9 mph14 km/h from SEPartly CloudyDrizzle
March 2836°F2°C46°F8°C7 mph12 km/h from SEDrizzleRain
March 2934°F1°C42°F6°C7 mph12 km/h from WMostly CloudyMostly Cloudy
March 3034°F1°C51°F10°C6 mph9 km/h from SEMostly CloudyRain
March 3136°F2°C46°F8°C6 mph10 km/h from NERainCloudy
April 131°F-1°C37°F3°C11 mph18 km/h from NDrizzlePartly Cloudy
April 225°F-4°C34°F1°C13 mph21 km/h from NWClearPartly Cloudy

Yes

Low of 37°F3°C, High of 46°F8°C
Wind: 7 mph12 km/h
Precipitation: 61% rain

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