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 (°C)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Max temperature (daytime)	-1	-2	1	6	12	17	19	18	14	9	5	1
Min temperature (night-time)	-7	-8	-5	-1	4	9	12	11	7	4	0	-4
Heat & Humidity	0	0	0	0	0	0	0	0	0	0	0	0
Sea temperature	2	1	0	1	5	10	15	17	13	9	6	4

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 (mm)	36	25	25	29	27	33	52	64	61	53	59	44

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 -1°C 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.

-1
-1°C max day temperature
1
1 hour of sunshine per day
20
20 days with some rainfall
-7
-7°C min night temperature
7
7 hours of daylight per day
0
No heat & humidity
36
36 mm of monthly rainfall
0
No UV (Maximum) Index UV index
2
2°C sea temperature

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Mariehamn weather in February

Expect daytime maximum temperatures of -2°C 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.

-2
-2°C max day temperature
1
1 hour of sunshine per day
15
15 days with some rainfall
-8
-8°C min night temperature
9
9 hours of daylight per day
0
No heat & humidity
25
25 mm of monthly rainfall
0
No UV (Maximum) Index UV index
1
1°C sea temperature

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Mariehamn weather in March

Expect daytime maximum temperatures of 1°C 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.

1
1°C max day temperature
3
3 hours of sunshine per day
14
14 days with some rainfall
-5
-5°C min night temperature
12
12 hours of daylight per day
0
No heat & humidity
25
25 mm of monthly rainfall
1
1 (Low) UV index
0
0°C sea temperature

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Mariehamn weather in April

Expect daytime maximum temperatures of 6°C 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.

6
6°C max day temperature
5
5 hours of sunshine per day
11
11 days with some rainfall
-1
-1°C min night temperature
15
15 hours of daylight per day
0
No heat & humidity
29
29 mm of monthly rainfall
3
3 (Moderate) UV index
1
1°C sea temperature

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Mariehamn weather in May

Expect daytime maximum temperatures of 12°C 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.

12
12°C max day temperature
8
8 hours of sunshine per day
10
10 days with some rainfall
4
4°C min night temperature
17
17 hours of daylight per day
0
No heat & humidity
27
27 mm of monthly rainfall
4
4 (Moderate) UV index
5
5°C sea temperature

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Mariehamn weather in June

Expect daytime maximum temperatures of 17°C 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.

17
17°C max day temperature
9
9 hours of sunshine per day
10
10 days with some rainfall
9
9°C min night temperature
19
19 hours of daylight per day
0
No heat & humidity
33
33 mm of monthly rainfall
5
5 (Moderate) UV index
10
10°C sea temperature

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Mariehamn weather in July

Expect daytime maximum temperatures of 19°C 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 52 mm of rainfall in the month.

19
19°C max day temperature
8
8 hours of sunshine per day
12
12 days with some rainfall
12
12°C min night temperature
18
18 hours of daylight per day
0
No heat & humidity
52
52 mm of monthly rainfall
5
5 (Moderate) UV index
15
15°C sea temperature

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Mariehamn weather in August

Expect daytime maximum temperatures of 18°C 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 64 mm of rainfall in the month.

18
18°C max day temperature
6
6 hours of sunshine per day
14
14 days with some rainfall
11
11°C min night temperature
16
16 hours of daylight per day
0
No heat & humidity
64
64 mm of monthly rainfall
4
4 (Moderate) UV index
17
17°C sea temperature

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Mariehamn weather in September

Expect daytime maximum temperatures of 14°C 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 61 mm of rainfall in the month.

14
14°C max day temperature
4
4 hours of sunshine per day
16
16 days with some rainfall
7
7°C min night temperature
13
13 hours of daylight per day
0
No heat & humidity
61
61 mm of monthly rainfall
3
3 (Moderate) UV index
13
13°C sea temperature

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Mariehamn weather in October

Expect daytime maximum temperatures of 9°C 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 53 mm of rainfall in the month.

9
9°C max day temperature
2
2 hours of sunshine per day
16
16 days with some rainfall
4
4°C min night temperature
10
10 hours of daylight per day
0
No heat & humidity
53
53 mm of monthly rainfall
1
1 (Low) UV index
9
9°C sea temperature

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Mariehamn weather in November

Expect daytime maximum temperatures of 5°C 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 59 mm of rainfall in the month.

5
5°C max day temperature
1
1 hour of sunshine per day
19
19 days with some rainfall
0
0°C min night temperature
7
7 hours of daylight per day
0
No heat & humidity
59
59 mm of monthly rainfall
0
No UV (Maximum) Index UV index
6
6°C sea temperature

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Mariehamn weather in December

Expect daytime maximum temperatures of 1°C 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 44 mm of rainfall in the month, which might fall as snow.

1
1°C max day temperature
1
1 hour of sunshine per day
19
19 days with some rainfall
-4
-4°C min night temperature
6
6 hours of daylight per day
0
No heat & humidity
44
44 mm of monthly rainfall
0
No UV (Maximum) Index UV index
4
4°C sea temperature

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