Climate - Aland (Finland)

The climate of the Åland islands is Baltic, that is, moderately continental, with cold winters, during which the average temperature is a few degrees below freezing, and mild to pleasantly warm summers.
The Åland islands lie between the southwest of Finland and the east coast of Sweden, and between the Baltic Sea to the south and the Gulf of Bothnia to the north, and their climate is mitigated by the sea. On average, the first snowfalls occur in November, though the ground is permanently snow-covered from the beginning of January to the end of March.
The white nights, when it doesn't get completely dark even at midnight, occur from 12 May to 1 August.
In winter, there can be cold spells of arctic origin. At Mariehamn airport, the coldest record is -32.9 °C (-27.2 °F) and was set in January 1979.
In summer, there can be short hot periods. The highest record is 31 °C (87.8 °F) and was set in July 2019.

Best Time

The best time to visit the Åland islands is the summer, from June to August, since it is the mildest season. However, you must take into account some rainy days and a bit of cold at night.

Aland - Climate data

In Aland, the average temperature of the coldest month (February) is of -2.6 °C (27.4 °F), that of the warmest month (July) is of 16.4 °C (61.5 °F). Here are the average temperatures.
In Aland, precipitation amounts to 630 millimeters (24.8 inches) per year: so, it is at an intermediate level. It ranges from 30 mm (1.2 in) in the driest month (April) to 75 mm (3 in) in the wettest one (October). Here is the average precipitation.
At Aland, the sea temperature ranges from 1.5 °C (35 °F) in February, March to 17.5 °C (64 °F) in August. Here are the average sea temperatures.
In Aland, there are on average around 1910 sunshine hours per year. Here are the average hours of sunshine per day.

Aland - Weather by month

Based on the period 1991-2020

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In January, the weather in Aland is usually very cold. The average temperature is of -1.6 °C (29 °F), with a minimum of -4.2 °C (24.5 °F) and a maximum of 1 °C (33.9 °F).
On the coldest nights of the month, the temperature usually drops to around -16 °C (3 °F). However, it dropped to -28.5 °C (-19.3 °F) in January 2003.
On the warmest days of the month, the temperature usually reaches around 6 °C (43 °F). However, it reached 9.8 °C (49.6 °F) in January 1992.
Precipitation amounts to 50 mm (2 in), distributed over 10 days.
The day lasts on average 6 hours and 50 minutes. So the days are short.
There are on average 1.5 hours of sunshine per day. So, the sun shines 18% of the time.
The average humidity is 87%. Hence, the air is normally humid.
The average wind speed is 15 kph (9 mph).
The average sea temperature is of 3 °C (37 °F). Therefore, the sea is very cold for swimming.

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In February, the coldest month of the year, the weather in Aland is usually very cold. The average temperature is of -2.6 °C (27 °F), with a minimum of -5.5 °C (22 °F) and a maximum of 0.4 °C (32.7 °F).
On the coldest nights of the month, the temperature usually drops to around -16.5 °C (2.5 °F). However, it dropped to -28.1 °C (-18.6 °F) in February 2011.
On the warmest days of the month, the temperature usually reaches around 6 °C (43 °F). However, it reached 10.1 °C (50.2 °F) in February 1991.
Precipitation amounts to 35 mm (1.4 in), distributed over 8 days.
The day lasts on average 9 hours and 10 minutes.
There are on average 2.5 hours of sunshine per day. So, the sun shines 29% of the time.
The average humidity is 86%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 1.5 °C (35 °F). Therefore, the sea is very cold for swimming.

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In March, the weather in Aland is usually very cold. The average temperature is of -0.4 °C (31 °F), with a minimum of -3.7 °C (25.4 °F) and a maximum of 2.9 °C (37.2 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -13.5 °C (7.5 °F). However, it dropped to -21.4 °C (-6.5 °F) in March 2005.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 9.5 °C (49.5 °F). However, it reached 17 °C (62.6 °F) in March 2017.
Precipitation amounts to 35 mm (1.4 in), distributed over 8 days.
The day lasts on average 11 hours and 55 minutes.
There are on average 4 hours of sunshine per day. So, the sun shines 35% of the time.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is 14 kph (9 mph).
The average sea temperature is of 1.5 °C (34.5 °F). Therefore, the sea is very cold for swimming.

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In April, the weather in Aland is usually cold. The average temperature is of 3.7 °C (39 °F), with a minimum of -0.3 °C (31.5 °F) and a maximum of 7.8 °C (46 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -6 °C (21 °F). However, it dropped to -9.3 °C (15.3 °F) in April 2013.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 15 °C (59 °F). However, it reached 20 °C (68 °F) in April 2019.
Precipitation amounts to 30 mm (1.2 in), distributed over 7 days.
The day lasts on average 14 hours and 40 minutes.
There are on average 7 hours of sunshine per day. So, the sun shines 47% of the time.
The average humidity is 76%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 2.5 °C (36.5 °F). Therefore, the sea is very cold for swimming.

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In May, the weather in Aland is usually mild. The average temperature is of 8.6 °C (47 °F), with a minimum of 4.1 °C (39.3 °F) and a maximum of 13.1 °C (55.6 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -3 °C (26.5 °F). However, it dropped to -5.9 °C (21.4 °F) in May 1999.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 21.5 °C (70.5 °F). However, it reached 27.1 °C (80.8 °F) in May 2018.
Precipitation amounts to 35 mm (1.4 in), distributed over 6 days.
The day lasts on average 17 hours and 20 minutes. So the days are very long.
There are on average 9.5 hours of sunshine per day. So, the sun shines 55% of the time.
The average humidity is 72%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 5.5 °C (42.5 °F). Therefore, the sea is very cold for swimming.

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In June, the weather in Aland is usually mild. The average temperature is of 12.9 °C (55 °F), with a minimum of 8.5 °C (47.3 °F) and a maximum of 17.3 °C (63.2 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 2 °C (35.5 °F). However, it dropped to -1.3 °C (29.7 °F) in June 2001.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 23.5 °C (74.5 °F). However, it reached 28.3 °C (82.9 °F) in June 2020.
Precipitation amounts to 55 mm (2.2 in), distributed over 8 days.
The day lasts on average 18 hours and 50 minutes. So the days are very long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
There are on average 10 hours of sunshine per day. So, the sun shines 52% of the time.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 11 °C (52 °F). Therefore, the sea is very cold for swimming.

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In July, the warmest month of the year, the weather in Aland is usually very mild. The average temperature is of 16.4 °C (61 °F), with a minimum of 12.2 °C (53.9 °F) and a maximum of 20.6 °C (69.1 °F).
On the coldest nights of the month, the temperature usually drops to around 5.5 °C (41.5 °F). However, it dropped to 2.1 °C (35.8 °F) in July 1992.
On the warmest days of the month, the temperature usually reaches around 26 °C (79 °F). However, it reached 31 °C (87.8 °F) in July 2018.
Precipitation amounts to 55 mm (2.2 in), distributed over 7 days.
The day lasts on average 17 hours and 55 minutes. So the days are very long.
There are on average 10 hours of sunshine per day. So, the sun shines 56% of the time.
The average humidity is 76%. Hence, the air is normally humid.
The average wind speed is 12 kph (7 mph).
The average sea temperature is of 16 °C (61 °F). Therefore, the sea is cold for swimming.

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In August, the weather in Aland is usually very mild. The average temperature is of 15.4 °C (60 °F), with a minimum of 11.1 °C (51.9 °F) and a maximum of 19.7 °C (67.5 °F).
On the coldest nights of the month, the temperature usually drops to around 4 °C (39 °F). However, it dropped to 0.7 °C (33.3 °F) in August 2007.
On the warmest days of the month, the temperature usually reaches around 25.5 °C (77.5 °F). However, it reached 29 °C (84.2 °F) in August 2014.
Precipitation amounts to 70 mm (2.8 in), distributed over 9 days.
The day lasts on average 15 hours and 30 minutes. So the days are long.
There are on average 7.5 hours of sunshine per day. So, the sun shines 49% of the time.
The average humidity is 79%. Hence, the air is normally humid.
The average wind speed is 12 kph (7 mph).
The average sea temperature is of 17.5 °C (63.5 °F). Therefore, the sea is cold for swimming.

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In September, the weather in Aland is usually mild. The average temperature is of 11.4 °C (53 °F), with a minimum of 7.5 °C (45.4 °F) and a maximum of 15.3 °C (59.6 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 0 °C (31.5 °F). However, it dropped to -3.5 °C (25.7 °F) in September 1996.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 20 °C (68 °F). However, it reached 24.8 °C (76.6 °F) in September 1992.
Precipitation amounts to 60 mm (2.4 in), distributed over 9 days.
The day lasts on average 12 hours and 50 minutes.
There are on average 5.5 hours of sunshine per day. So, the sun shines 42% of the time.
The average humidity is 83%. Hence, the air is normally humid.
The average wind speed is 12 kph (8 mph).
The average sea temperature is of 14.5 °C (58.5 °F). Therefore, the sea is very cold for swimming.

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In October, the weather in Aland is usually quite cold. The average temperature is of 6.4 °C (44 °F), with a minimum of 3.3 °C (37.9 °F) and a maximum of 9.6 °C (49.2 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around -5 °C (23 °F). However, it dropped to -10.8 °C (12.6 °F) in October 2002.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 14.5 °C (58.5 °F). However, it reached 18 °C (64.4 °F) in October 2015.
Precipitation amounts to 75 mm (3 in), distributed over 12 days.
The day lasts on average 10 hours and 0 minutes.
There are on average 3 hours of sunshine per day. So, the sun shines 29% of the time.
The average humidity is 85%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 11 °C (51.5 °F). Therefore, the sea is very cold for swimming.

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In November, the weather in Aland is usually cold. The average temperature is of 3.1 °C (38 °F), with a minimum of 0.8 °C (33.5 °F) and a maximum of 5.4 °C (41.7 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around -7.5 °C (18 °F). However, it dropped to -20 °C (-4 °F) in November 2010.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 10 °C (50.5 °F). However, it reached 16.6 °C (61.9 °F) in November 2020.
Precipitation amounts to 65 mm (2.6 in), distributed over 13 days.
The day lasts on average 7 hours and 25 minutes. So the days are short.
There are on average 1.5 hours of sunshine per day. So, the sun shines 18% of the time.
The average humidity is 88%. Hence, the air is normally humid.
The average wind speed is 14 kph (9 mph).
The average sea temperature is of 7.5 °C (45.5 °F). Therefore, the sea is very cold for swimming.

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In December, the weather in Aland is usually cold. The average temperature is of 0.6 °C (33 °F), with a minimum of -1.8 °C (28.7 °F) and a maximum of 2.9 °C (37.3 °F).
On the coldest nights of the month, the temperature usually drops to around -12 °C (10 °F). However, it dropped to -24.6 °C (-12.3 °F) in December 1996.
On the warmest days of the month, the temperature usually reaches around 7 °C (44.5 °F). However, it reached 11.1 °C (52 °F) in December 2015.
Precipitation amounts to 60 mm (2.4 in), distributed over 13 days.
The day lasts on average 6 hours and 0 minutes. So the days are short. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
There is an average of 1 hour of sunshine per day. So, the sun shines 14% of the time.
The average humidity is 88%. Hence, the air is normally humid.
The average wind speed is 15 kph (9 mph).
The average sea temperature is of 5 °C (41 °F). Therefore, the sea is very cold for swimming.