Yes

you do need a jacket based on the weather in Mariehamn, Ă…land Islands 1 second ago

Why? Because it's cold enough that makes you wish you had a hat, but you're still too proud to admit it and there are strong winds blowing out there!
49°F9°C & Windy

Wind is 21 mph33 km/h from the South, gusting to 31 mph50 km/h
November 2
4am49°F9°C21 mph33 km/h SouthDrizzle
5am49°F9°C20 mph33 km/h SouthDrizzle
6am49°F10°C20 mph32 km/h SouthRain
7am50°F10°C17 mph28 km/h SouthDrizzle
8am51°F10°C13 mph20 km/h SouthwestDrizzle
9am51°F10°C11 mph17 km/h WestMostly Cloudy
10am51°F10°C11 mph17 km/h WestCloudy
11am50°F10°C9 mph15 km/h WestMostly Cloudy
12pm50°F10°C9 mph15 km/h WestCloudy
1pm50°F10°C8 mph13 km/h WestCloudy
2pm50°F10°C7 mph11 km/h SouthwestCloudy
3pm49°F10°C6 mph10 km/h SouthwestCloudy
DateLowHighWindDayNight
November 148°F9°C51°F11°C11 mph18 km/h from SouthwestRainCloudy
November 247°F8°C49°F9°C11 mph18 km/h from SouthwestMostly CloudyPartly Cloudy
November 346°F8°C53°F12°C18 mph29 km/h from SouthwestWindyWindy
November 450°F10°C53°F12°C16 mph26 km/h from SouthwestWindyCloudy
November 549°F9°C51°F11°C11 mph18 km/h from SouthwestCloudyCloudy
November 648°F9°C52°F11°C13 mph21 km/h from SouthwestMostly CloudyMostly Cloudy
November 746°F8°C50°F10°C12 mph19 km/h from SouthwestMostly CloudyMostly Cloudy

Yes

Low of 47°F9°C, High of 49°F10°C
Wind: 11 mph18 km/h
Precipitation: None

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