Climate - Vaasa (Finland)

The climate of Vaasa is cold continental, with freezing winters and mild summers.
The city is located in central Finland, on the coast of the Gulf of Bothnia.
The white nights, when it doesn't get completely dark even at midnight, occur from 2 May to 12 August.
In winter, there can be cold spells of arctic origin. The coldest record is -38.6 °C (-37.5 °F) and was set in February 1966.
During cold periods, the sea can freeze. It is useful to recall that sea water freezes at about -2 °C (28.5 °F).
In summer, also due to the length of the days, the sunshine amount is quite good, and definitely better than in Norway. Sometimes there can be short hot periods. The highest record is 33.7 °C (92.7 °F) and was set in July 2018.

Best Time

The best time to visit Vaasa 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.

Vaasa - Climate data

In Vaasa, the average temperature of the coldest month (February) is of -5.7 °C (21.7 °F), that of the warmest month (July) is of 16.9 °C (62.3 °F). Here are the average temperatures.
In Vaasa, precipitation amounts to 575 millimeters (22.6 inches) per year: so, it is at an intermediate level. It ranges from 25 mm (1 in) in the driest month (April) to 70 mm (2.8 in) in the wettest ones (July, August) Here is the average precipitation.
At Vaasa, the sea temperature ranges from 0 °C (32 °F) in March to 15 °C (59 °F) in August. Here are the average sea temperatures.
In Vaasa, there are on average around 1785 sunshine hours per year. Here are the average hours of sunshine per day.

Vaasa - Weather by month

Based on the period 1991-2020

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In January, the weather in Vaasa is usually very cold. The average temperature is of -5.0 °C (23 °F), with a minimum of -8.1 °C (17.4 °F) and a maximum of -2 °C (28.5 °F).
On the coldest nights of the month, the temperature usually drops to around -22.5 °C (-8 °F). However, it dropped to -37 °C (-34.6 °F) in January 1999.
On the warmest days of the month, the temperature usually reaches around 4.5 °C (40 °F). However, it reached 7.7 °C (45.9 °F) in January 2020.
Precipitation amounts to 40 mm (1.6 in), distributed over 10 days.
The day lasts on average 6 hours and 0 minutes. So the days are short.
There is an average of 1 hour of sunshine per day. So, the sun shines 16% of the time.
The average humidity is 89%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 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 February, the coldest month of the year, the weather in Vaasa is usually freezing cold. The average temperature is of -5.7 °C (22 °F), with a minimum of -9.1 °C (15.6 °F) and a maximum of -2.3 °C (27.8 °F).
On the coldest nights of the month, the temperature usually drops to around -22 °C (-7.5 °F). However, it dropped to -31 °C (-23.8 °F) in February 2011.
On the warmest days of the month, the temperature usually reaches around 4.5 °C (39.5 °F). However, it reached 8 °C (46.4 °F) in February 2017.
Precipitation amounts to 30 mm (1.2 in), distributed over 8 days.
The day lasts on average 8 hours and 50 minutes.
There are on average 2.5 hours of sunshine per day. So, the sun shines 29% of the time.
The average humidity is 87%. Hence, the air is normally humid.
The average wind speed is 12 kph (8 mph).
The average sea temperature is of 0.5 °C (32.5 °F). Therefore, the sea is very cold for swimming.

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In March, the weather in Vaasa is usually very cold. The average temperature is of -2.3 °C (28 °F), with a minimum of -6 °C (21.2 °F) and a maximum of 1.4 °C (34.5 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -18 °C (0 °F). However, it dropped to -26.3 °C (-15.3 °F) in March 2006.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 8 °C (46.5 °F). However, it reached 14.5 °C (58.1 °F) in March 2007.
Precipitation amounts to 30 mm (1.2 in), distributed over 7 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 13 kph (8 mph).
The average sea temperature is of 0 °C (32 °F). Therefore, the sea is very cold for swimming.

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In April, the weather in Vaasa is usually cold. The average temperature is of 3.2 °C (38 °F), with a minimum of -0.9 °C (30.4 °F) and a maximum of 7.3 °C (45.1 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -7.5 °C (18 °F). However, it dropped to -16 °C (3.2 °F) in April 2018.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 15.5 °C (60.5 °F). However, it reached 22.5 °C (72.5 °F) in April 2019.
Precipitation amounts to 25 mm (1 in), distributed over 7 days.
The day lasts on average 15 hours and 5 minutes.
There are on average 6.5 hours of sunshine per day. So, the sun shines 42% of the time.
The average humidity is 73%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 1 °C (33.5 °F). Therefore, the sea is very cold for swimming.

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In May, the weather in Vaasa is usually mild. The average temperature is of 8.9 °C (48 °F), with a minimum of 4.1 °C (39.4 °F) and a maximum of 13.6 °C (56.5 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -3 °C (27 °F). However, it dropped to -6.4 °C (20.5 °F) in May 2007.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 23 °C (73 °F). However, it reached 28.7 °C (83.7 °F) in May 2013.
Precipitation amounts to 40 mm (1.6 in), distributed over 7 days.
The day lasts on average 18 hours and 10 minutes. So the days are very long.
There are on average 9 hours of sunshine per day. So, the sun shines 49% of the time.
The average humidity is 66%.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 3 °C (37.5 °F). Therefore, the sea is very cold for swimming.

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In June, the weather in Vaasa is usually mild. The average temperature is of 13.6 °C (56 °F), with a minimum of 9 °C (48.3 °F) and a maximum of 18.1 °C (64.5 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 2.5 °C (36 °F). However, it dropped to -2.3 °C (27.9 °F) in June 2004.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 25.5 °C (77.5 °F). However, it reached 31.8 °C (89.2 °F) in June 2011.
Precipitation amounts to 55 mm (2.2 in), distributed over 8 days.
The day lasts on average 20 hours and 10 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 50% of the time.
The average humidity is 67%.
The average wind speed is 12 kph (8 mph).
The average sea temperature is of 8 °C (46 °F). Therefore, the sea is very cold for swimming.

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In July, the warmest month of the year, the weather in Vaasa is usually very mild. The average temperature is of 16.9 °C (62 °F), with a minimum of 12.5 °C (54.4 °F) and a maximum of 21.2 °C (70.2 °F).
On the coldest nights of the month, the temperature usually drops to around 5 °C (41 °F). However, it dropped to 0 °C (32 °F) in July 2020.
On the warmest days of the month, the temperature usually reaches around 27.5 °C (81.5 °F). However, it reached 33.7 °C (92.7 °F) in July 2018.
Precipitation amounts to 70 mm (2.8 in), distributed over 8 days.
The day lasts on average 19 hours and 0 minutes. So the days are very long.
There are on average 9 hours of sunshine per day. So, the sun shines 48% of the time.
The average humidity is 73%. Hence, the air is normally humid.
The average wind speed is 11 kph (7 mph).
The average sea temperature is of 13.5 °C (56.5 °F). Therefore, the sea is very cold for swimming.

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In August, the weather in Vaasa is usually very mild. The average temperature is of 15.5 °C (60 °F), with a minimum of 11.3 °C (52.3 °F) and a maximum of 19.7 °C (67.4 °F).
On the coldest nights of the month, the temperature usually drops to around 3 °C (37.5 °F). However, it dropped to 1.9 °C (35.4 °F) in August 2008.
On the warmest days of the month, the temperature usually reaches around 26 °C (78.5 °F). However, it reached 32 °C (89.6 °F) in August 2014.
Precipitation amounts to 70 mm (2.8 in), distributed over 10 days.
The day lasts on average 16 hours and 0 minutes. So the days are long.
There are on average 7 hours of sunshine per day. So, the sun shines 44% of the time.
The average humidity is 78%. Hence, the air is normally humid.
The average wind speed is 11 kph (7 mph).
The average sea temperature is of 15 °C (59.5 °F). Therefore, the sea is cold for swimming.

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In September, the weather in Vaasa is usually mild. The average temperature is of 10.6 °C (51 °F), with a minimum of 6.8 °C (44.2 °F) and a maximum of 14.4 °C (58 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around -1.5 °C (29 °F). However, it dropped to -5 °C (23 °F) in September 1998.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 21 °C (69.5 °F). However, it reached 25.1 °C (77.2 °F) in September 2019.
Precipitation amounts to 50 mm (2 in), distributed over 9 days.
The day lasts on average 12 hours and 55 minutes.
There are on average 4.5 hours of sunshine per day. So, the sun shines 34% of the time.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is 11 kph (7 mph).
The average sea temperature is of 12.5 °C (54 °F). Therefore, the sea is very cold for swimming.

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In October, the weather in Vaasa is usually quite cold. The average temperature is of 4.8 °C (41 °F), with a minimum of 2 °C (35.7 °F) and a maximum of 7.5 °C (45.5 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around -7 °C (19.5 °F). However, it dropped to -20.4 °C (-4.7 °F) in October 1992.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 13 °C (56 °F). However, it reached 19 °C (66.2 °F) in October 2018.
Precipitation amounts to 65 mm (2.6 in), distributed over 10 days.
The day lasts on average 9 hours and 40 minutes.
There are on average 2.5 hours of sunshine per day. So, the sun shines 28% of the time.
The average humidity is 87%. Hence, the air is normally humid.
The average wind speed is 12 kph (7 mph).
The average sea temperature is of 8.5 °C (47 °F). Therefore, the sea is very cold for swimming.

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In November, the weather in Vaasa is usually cold. The average temperature is of 0.2 °C (32 °F), with a minimum of -2 °C (28.3 °F) and a maximum of 2.5 °C (36.5 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around -12 °C (10.5 °F). However, it dropped to -23.6 °C (-10.5 °F) in November 2010.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 8 °C (46.5 °F). However, it reached 12.6 °C (54.7 °F) in November 2015.
Precipitation amounts to 50 mm (2 in), distributed over 11 days.
The day lasts on average 6 hours and 40 minutes. So the days are short.
There are on average 1.5 hours of sunshine per day. So, the sun shines 20% of the time.
The average humidity is 91%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 5 °C (41 °F). Therefore, the sea is very cold for swimming.

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In December, the weather in Vaasa is usually very cold. The average temperature is of -2.8 °C (27 °F), with a minimum of -5.6 °C (22 °F) and a maximum of 0 °C (32 °F).
On the coldest nights of the month, the temperature usually drops to around -17 °C (1.5 °F). However, it dropped to -30.1 °C (-22.2 °F) in December 2002.
On the warmest days of the month, the temperature usually reaches around 5.5 °C (42 °F). However, it reached 8.7 °C (47.7 °F) in December 2015.
Precipitation amounts to 50 mm (2 in), distributed over 11 days.
The day lasts on average 4 hours and 55 minutes. So the days are short. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
There are on average 0.5 hours of sunshine per day. So, the sun shines 14% of the time.
The average humidity is 90%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 3 °C (37 °F). Therefore, the sea is very cold for swimming.