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December weather forecast in Mariehamn

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Sun

Sunday

Mon

Monday

Tue

Tuesday

Wed

Wednesday

Thu

Thursday

Fri

Friday

Sat

Saturday

30 November, sun

	758 mmHg		83%
	7.9 m/s		+6

30 November, Sunday. day, 3°; night, 0°; rain

1 December, mon

	758 mmHg		83%
	8.39 m/s		+6

1 December, Monday. day, 3°; night, 1°; overcast

2 December, tue

	759 mmHg		85%
	7.3 m/s		+6

2 December, Tuesday. day, 3°; night, 0°; rain

3 December, wed

	758 mmHg		85%
	6.8 m/s		+6

3 December, Wednesday. day, 2°; night, 0°; partly cloudy

4 December, thu

	757 mmHg		86%
	7.3 m/s		+6

4 December, Thursday. day, 2°; night, 0°; rain

5 December, fri

	756 mmHg		83%
	8 m/s		+6

5 December, Friday. day, 3°; night, 0°; overcast

6 December, sat

	756 mmHg		86%
	7.5 m/s		+5

6 December, Saturday. day, 2°; night, 0°; rain

7 December, sun

	757 mmHg		85%
	7.3 m/s		+5

7 December, Sunday. day, 3°; night, 0°; rain

8 December, mon

	758 mmHg		84%
	7.5 m/s		+5

8 December, Monday. day, 2°; night, 0°; overcast

9 December, tue

	759 mmHg		86%
	7 m/s		+5

9 December, Tuesday. day, 3°; night, 0°; overcast

10 December, wed

	759 mmHg		88%
	7.1 m/s		+5

10 December, Wednesday. day, 3°; night, 0°; overcast

11 December, thu

	759 mmHg		87%
	7.3 m/s		+5

11 December, Thursday. day, 2°; night, 0°; partly cloudy

12 December, fri

	759 mmHg		84%
	7.8 m/s		+5

12 December, Friday. day, 2°; night, 0°; clear

13 December, sat

	759 mmHg		87%
	7.3 m/s		+5

13 December, Saturday. day, 2°; night, -1°; rain

14 December, sun

	759 mmHg		85%
	7.4 m/s		+5

14 December, Sunday. day, 2°; night, 0°; partly cloudy

15 December, mon

	758 mmHg		85%
	7.7 m/s		+5

15 December, Monday. day, 1°; night, 0°; rain

16 December, tue

	758 mmHg		85%
	8.1 m/s		+5

16 December, Tuesday. day, 2°; night, 0°; clear

17 December, wed

	757 mmHg		86%
	7.9 m/s		+5

17 December, Wednesday. day, 2°; night, 0°; overcast

18 December, thu

	757 mmHg		86%
	7.5 m/s		+4

18 December, Thursday. day, 2°; night, 0°; rain

19 December, fri

	755 mmHg		85%
	7.9 m/s		+4

19 December, Friday. day, 2°; night, 0°; partly cloudy

20 December, sat

	756 mmHg		83%
	7.9 m/s		+4

20 December, Saturday. day, 1°; night, 0°; partly cloudy

21 December, sun

	756 mmHg		84%
	7.5 m/s		+4

21 December, Sunday. day, 0°; night, -1°; clear

22 December, mon

	755 mmHg		84%
	8.2 m/s		+4

22 December, Monday. day, 0°; night, -2°; snow

23 December, tue

	754 mmHg		84%
	7.6 m/s		+4

23 December, Tuesday. day, 0°; night, -2°; snow

24 December, wed

	754 mmHg		84%
	8 m/s		+4

24 December, Wednesday. day, 0°; night, -2°; partly cloudy

25 December, thu

	753 mmHg		85%
	8.39 m/s		+4

25 December, Thursday. day, 1°; night, -1°; rain

26 December, fri

	754 mmHg		85%
	8 m/s		+4

26 December, Friday. day, 1°; night, -1°; partly cloudy

27 December, sat

	755 mmHg		85%
	7.7 m/s		+4

27 December, Saturday. day, 1°; night, -1°; partly cloudy

28 December, sun

	757 mmHg		85%
	7.6 m/s		+4

28 December, Sunday. day, 1°; night, -1°; rain

29 December, mon

	756 mmHg		88%
	7.8 m/s		+4

29 December, Monday. day, 1°; night, -1°; rain

30 December, tue

	756 mmHg		86%
	7.9 m/s		+4

30 December, Tuesday. day, 1°; night, -1°; overcast

31 December, wed

	757 mmHg		85%
	7.7 m/s		+4

31 December, Wednesday. day, 1°; night, -1°; clear

1 January, thu

	756 mmHg		86%
	7.5 m/s		+3

1 January, Thursday. day, 1°; night, -2°; rain

2 January, fri

	757 mmHg		85%
	8.1 m/s		+3

2 January, Friday. day, 0°; night, -2°; rain

3 January, sat

	757 mmHg		83%
	7.5 m/s		+3

3 January, Saturday. day, 0°; night, -2°; snow

Average data for 10 years

Mariehamn December

4

sunny days

12

days with precipitation

17

cloudy days

4 sunny days; 12 days with precipitation; 17 cloudy days;

85

%

air humidity

5.8

m/s

WindS

52

mm of precipitation

(10% of annual average)

+5

°C

Water temperature

air humidity 85%; 52 millimeters of precipitation (10% of annual average); Wind southerly 5.8 Meters per second; Water temperature +5°

Weather graphs for December

TemperatureWater temperaturePrecipitation chance, %Humidity, %Wind, m/sPressure, mmHg

SW

S

S

S

S

S

S

SW

S

S

S

S

S

S

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

S

SW

SW

S

S

SW

SW

1

Average data for 10 years

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

Daytime temperature

Night-time temperature

Cities near you

Stockholm
Pori
Umeå
Kuressaare
Vaasa
Uppsala
Ventspils
Sundsvall
Visby

Cities with similar weather in December

Riga
Reykyavik
Oslo
Yurmala
Toronto
Palanga
Chicago
Gdansk
Klaipeda

The weather forecast for December 2025 is based on historical data from the past 10 years.

In December, the weather in Mariehamn is typically cold. Average daily high temperature in December is about 2 degrees above zero. On average, Mariehamn has 12 cloudy, 8 partly cloudy, 5 rainy, 4 sunny, and 2 snowy days in December. The rains are usually moderate. December as well as January, March, April, and October is considered the most uncomfortable time to visit Mariehamn.

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