How many sunny days does Mariehamn have per year?

Mariehamn averages approximately 161 sunny days per year, based on historical climate data.

What is the air quality in Mariehamn?

Mariehamn has an annual PM2.5 concentration of 4.4 µg/m³, classified as "Excellent" by WHO standards. Meets WHO guideline. Minimal health risk.

Mariehamns stad

Mariehamn · Aland Islands

The capital and largest city of Aland Islands.

Small city

11K

11m

07:08 UTC+2

EUR

Explore on map →Climate twin →

Mariehamn, Aland Islands is a 11K-resident city with 161 sunny days and 62 frost days annually and an annual PM2.5 of 4.4 µg/m³. The capital and largest city of Aland Islands.

Find your city match in 5 minutes

Take the quiz

Climate

Feels-like °C

-16

-11

-3

-8

-14

Dinner outside

Climate Lab·Mariehamn

Monthly climate metrics across temperature, precipitation, wind, and UV.

Full page →

Metric	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Temperature
Daily high°C	4	3	4	5	10	18	18	19	16	13	9	5	10
Daily mean°C	1	1	2	3	8	14	17	18	14	10	6	1	8
Daily low°C	-1	-2	-1	0	5	11	15	16	11	7	1	-3	5
Thermal comfort
High feelsDaily high feels-like°C	-7	-5	2	10	15	25	22	24	16	7	1	-7	8
Mean feelsDaily mean feels-like°C	-16	-16	-11	-3	7	18	18	16	9	0	-8	-14	0
Low feelsDaily low feels-like°C	-24	-24	-21	-15	-4	7	9	8	0	-8	-19	-22	-9
Humidity
HumidityRelative humidity%	82	82	81	81	80	85	82	83	84	83	83	80	82
Dewpoint°C	-1.8	-1.2	-0.5	0.4	4.6	11.4	13.4	14.5	11.4	8.0	2.7	-2.8	5.0
Precipitation
Rainfallmm	57	17	24	23	29	25	59	74	45	85	54	38	530
Rain days≥1mm	11	8	5	7	6	4	11	14	10	16	14	11	117
Snowfallmm	15	24	12	3	0	0	0	0	0	0	3	23	80
Snow days≥1mm	4	6	3	1	0	0	0	0	0	0	2	5	21
Wind
Wind avgm/s	8.9	8.0	7.3	6.4	5.4	4.6	6.0	6.1	6.7	8.2	8.1	8.0	7.0
Wind gustsm/s	14.3	12.9	12.8	12.2	10.1	9.6	10.2	11.0	11.3	12.4	11.8	12.5	11.7
Sun & UV
Sunshinehrs/day	0.0	3.0	7.0	11.2	12.5	13.9	12.8	11.2	8.2	4.0	0.0	0.0	7.0
Clear skyindex	10%	25%	34%	56%	55%	63%	48%	50%	30%	32%	16%	6%	35%
UV indexmax avg	0.1	0.4	1.1	2.4	3.8	5.0	4.3	3.5	2.0	0.8	0.2	0.1	2.0

Based on 2014–2024 hourly climate data · Updated Mar 2025

Confidence: High

Lifestyle Calendar·Mariehamn

Outdoor living in Mariehamn is seasonal. October through March are the toughest stretch. Even dinner outside manages 1/12 months, while walking works 6/12 months.

Full page →

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Annual

1/12

Dinner Outside

0Jan: 0% viability

0Feb: 0% viability

0Mar: 0% viability

5Apr: 5% viability

29May: 29% viability

69Jun: 69% viability

59Jul: 59% viability

49Aug: 49% viability

26Sep: 26% viability

1Oct: 1% viability

0Nov: 0% viability

0Dec: 0% viability

1/12

Dinner Outside

0Jan: 0% viability

0Feb: 0% viability

0Mar: 0% viability

5Apr: 5% viability

29May: 29% viability

69Jun: 69% viability

59Jul: 59% viability

49Aug: 49% viability

26Sep: 26% viability

1Oct: 1% viability

0Nov: 0% viability

0Dec: 0% viability

20%

Cold

1/12

Lunch Outside

0Jan: 0% viability

1Feb: 1% viability

8Mar: 8% viability

28Apr: 28% viability

62May: 62% viability

72Jun: 72% viability

58Jul: 58% viability

56Aug: 56% viability

56Sep: 56% viability

15Oct: 15% viability

4Nov: 4% viability

0Dec: 0% viability

1/12

Lunch Outside

0Jan: 0% viability

1Feb: 1% viability

8Mar: 8% viability

28Apr: 28% viability

62May: 62% viability

72Jun: 72% viability

58Jul: 58% viability

56Aug: 56% viability

56Sep: 56% viability

15Oct: 15% viability

4Nov: 4% viability

0Dec: 0% viability

30%

Cold

6/12

Walking

38Jan: 38% viability

44Feb: 44% viability

64Mar: 64% viability

70Apr: 70% viability

84May: 84% viability

86Jun: 86% viability

80Jul: 80% viability

75Aug: 75% viability

71Sep: 71% viability

45Oct: 45% viability

54Nov: 54% viability

52Dec: 52% viability

6/12

Walking

38Jan: 38% viability

44Feb: 44% viability

64Mar: 64% viability

70Apr: 70% viability

84May: 84% viability

86Jun: 86% viability

80Jul: 80% viability

75Aug: 75% viability

71Sep: 71% viability

45Oct: 45% viability

54Nov: 54% viability

52Dec: 52% viability

64%

Wind

6/12

Running

38Jan: 38% viability

44Feb: 44% viability

64Mar: 64% viability

70Apr: 70% viability

84May: 84% viability

86Jun: 86% viability

80Jul: 80% viability

75Aug: 75% viability

71Sep: 71% viability

45Oct: 45% viability

54Nov: 54% viability

52Dec: 52% viability

6/12

Running

38Jan: 38% viability

44Feb: 44% viability

64Mar: 64% viability

70Apr: 70% viability

84May: 84% viability

86Jun: 86% viability

80Jul: 80% viability

75Aug: 75% viability

71Sep: 71% viability

45Oct: 45% viability

54Nov: 54% viability

52Dec: 52% viability

64%

Wind

Tap any month for details · Click activity name for overview

ComfortableModerateUncomfortable

Based on 2014–2024 hourly climate data · Updated Mar 2025

Confidence: High

Mariehamn · Aland Islands

Climate

Climate Lab·Mariehamn

Lifestyle Calendar·Mariehamn

Air Quality Profile

Air Quality Profile

Who thrives in Mariehamn

Frequently asked about Mariehamn