Mariehamn weather by month

Check out Mariehamn weather averages by month. Compare detailed monthly climate statistics including temperature, rainfall and sunshine figures.

Temperature
Rainfall
Sunshine & daylight
UV levels & humidity

Temperature in Mariehamn (°F)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Max temperature (daytime)	30	28	34	43	54	63	66	64	57	48	41	34
Min temperature (night-time)	19	18	23	30	39	48	54	52	45	39	32	25
Heat & Humidity	0	0	0	0	0	0	0	0	0	0	0	0
Sea temperature	36	34	32	34	41	50	59	63	55	48	43	39

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

Sunshine & Daylight in Mariehamn

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Daily hours of sunshine	1	1	3	5	8	9	8	6	4	2	1	1
Daily hours of daylight	7	9	12	15	17	19	18	16	13	10	7	6
UV Index (Maximum)	0	0	1	3	4	5	5	4	3	1	0	0

Rainfall in Mariehamn

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Number of days with some rain	20	15	14	11	10	10	12	14	16	16	19	19
Average monthly rainfall (inches)	1.4	1.0	1.0	1.1	1.1	1.3	2.0	2.5	2.4	2.1	2.3	1.7

More about Mariehamn

Mariehamn by month

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

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The climate guide for Finland (Mariehamn) shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

What's the climate like in Mariehamn?

Mariehamn has a cold climate with warm summers and some rainfall in all months.

Mariehamn weather in January

Expect daytime maximum temperatures of 30°F in Mariehamn, Finland in January based on long-term weather averages. There is 1 hour of sunshine per day on average with 20 days with some rainfall, which might fall as snow.

30
30°F max day temperature
1
1 hour of sunshine per day
20
20 days with some rainfall
19
19°F min night temperature
7
7 hours of daylight per day
0
No heat & humidity
1.4
1.4 inches of monthly rainfall
0
No UV (Maximum) Index UV index
36
36°F sea temperature

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Mariehamn weather in February

Expect daytime maximum temperatures of 28°F in Mariehamn, Finland in February based on long-term weather averages. There is 1 hour of sunshine per day on average with 15 days with some rainfall, which might fall as snow.

28
28°F max day temperature
1
1 hour of sunshine per day
15
15 days with some rainfall
18
18°F min night temperature
9
9 hours of daylight per day
0
No heat & humidity
1.0
1.0 inches of monthly rainfall
0
No UV (Maximum) Index UV index
34
34°F sea temperature

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Mariehamn weather in March

Expect daytime maximum temperatures of 34°F in Mariehamn, Finland in March based on long-term weather averages. There are 3 hours of sunshine per day on average with 14 days with some rainfall, which might fall as snow.

34
34°F max day temperature
3
3 hours of sunshine per day
14
14 days with some rainfall
23
23°F min night temperature
12
12 hours of daylight per day
0
No heat & humidity
1.0
1.0 inches of monthly rainfall
1
1 (Low) UV index
32
32°F sea temperature

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Mariehamn weather in April

Expect daytime maximum temperatures of 43°F in Mariehamn, Finland in April based on long-term weather averages. There are 5 hours of sunshine per day on average with 11 days with some rainfall.

43
43°F max day temperature
5
5 hours of sunshine per day
11
11 days with some rainfall
30
30°F min night temperature
15
15 hours of daylight per day
0
No heat & humidity
1.1
1.1 inches of monthly rainfall
3
3 (Moderate) UV index
34
34°F sea temperature

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Mariehamn weather in May

Expect daytime maximum temperatures of 54°F in Mariehamn, Finland in May based on long-term weather averages. There are 8 hours of sunshine per day on average with 10 days with some rainfall.

54
54°F max day temperature
8
8 hours of sunshine per day
10
10 days with some rainfall
39
39°F min night temperature
17
17 hours of daylight per day
0
No heat & humidity
1.1
1.1 inches of monthly rainfall
4
4 (Moderate) UV index
41
41°F sea temperature

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Mariehamn weather in June

Expect daytime maximum temperatures of 63°F in Mariehamn, Finland in June based on long-term weather averages. There are 9 hours of sunshine per day on average with 10 days with some rainfall.

63
63°F max day temperature
9
9 hours of sunshine per day
10
10 days with some rainfall
48
48°F min night temperature
19
19 hours of daylight per day
0
No heat & humidity
1.3
1.3 inches of monthly rainfall
5
5 (Moderate) UV index
50
50°F sea temperature

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Mariehamn weather in July

Expect daytime maximum temperatures of 66°F in Mariehamn, Finland in July based on long-term weather averages. There are 8 hours of sunshine per day on average with 12 days with some rainfall and typically 2.0 inches of rainfall in the month.

66
66°F max day temperature
8
8 hours of sunshine per day
12
12 days with some rainfall
54
54°F min night temperature
18
18 hours of daylight per day
0
No heat & humidity
2.0
2.0 inches of monthly rainfall
5
5 (Moderate) UV index
59
59°F sea temperature

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Mariehamn weather in August

Expect daytime maximum temperatures of 64°F in Mariehamn, Finland in August based on long-term weather averages. There are 6 hours of sunshine per day on average with 14 days with some rainfall and typically 2.5 inches of rainfall in the month.

64
64°F max day temperature
6
6 hours of sunshine per day
14
14 days with some rainfall
52
52°F min night temperature
16
16 hours of daylight per day
0
No heat & humidity
2.5
2.5 inches of monthly rainfall
4
4 (Moderate) UV index
63
63°F sea temperature

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Mariehamn weather in September

Expect daytime maximum temperatures of 57°F in Mariehamn, Finland in September based on long-term weather averages. There are 4 hours of sunshine per day on average with 16 days with some rainfall and typically 2.4 inches of rainfall in the month.

57
57°F max day temperature
4
4 hours of sunshine per day
16
16 days with some rainfall
45
45°F min night temperature
13
13 hours of daylight per day
0
No heat & humidity
2.4
2.4 inches of monthly rainfall
3
3 (Moderate) UV index
55
55°F sea temperature

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Mariehamn weather in October

Expect daytime maximum temperatures of 48°F in Mariehamn, Finland in October based on long-term weather averages. There are 2 hours of sunshine per day on average with 16 days with some rainfall and typically 2.1 inches of rainfall in the month.

48
48°F max day temperature
2
2 hours of sunshine per day
16
16 days with some rainfall
39
39°F min night temperature
10
10 hours of daylight per day
0
No heat & humidity
2.1
2.1 inches of monthly rainfall
1
1 (Low) UV index
48
48°F sea temperature

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Mariehamn weather in November

Expect daytime maximum temperatures of 41°F in Mariehamn, Finland in November based on long-term weather averages. There is 1 hour of sunshine per day on average with 19 days with some rainfall and typically 2.3 inches of rainfall in the month.

41
41°F max day temperature
1
1 hour of sunshine per day
19
19 days with some rainfall
32
32°F min night temperature
7
7 hours of daylight per day
0
No heat & humidity
2.3
2.3 inches of monthly rainfall
0
No UV (Maximum) Index UV index
43
43°F sea temperature

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Mariehamn weather in December

Expect daytime maximum temperatures of 34°F in Mariehamn, Finland in December based on long-term weather averages. There is 1 hour of sunshine per day on average with 19 days with some rainfall and typically 1.7 inches of rainfall in the month, which might fall as snow.

34
34°F max day temperature
1
1 hour of sunshine per day
19
19 days with some rainfall
25
25°F min night temperature
6
6 hours of daylight per day
0
No heat & humidity
1.7
1.7 inches of monthly rainfall
0
No UV (Maximum) Index UV index
39
39°F sea temperature

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