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 occur from 2 May to 12 August.
The average temperature of the coldest month (February) is of -7.4 °C (19 °F), that of the warmest month (July) is of 16.3 °C (61 °F). The temperature dropped to -39 °C (-38 °F) in January 1999, while it reached 32 °C (89.5 °F) in July 2018. Here are the average temperatures.
Vaasa - Average temperatures
Min (°C)-10-11-8-138111062-2-6
Max (°C)-3-3181418222015830
Min (°F)141218303746525043362821
Max (°F)272734465764726859463732

Precipitation amounts to 500 millimeters (19.7 inches) per year: it is therefore quite scarce. It ranges from 20 mm (0.8 in) in the driest month (February) to 70 mm (2.8 in) in the wettest (August). Here is the average precipitation.
Vaasa - Average precipitation

On average, there are around 1,780 sunshine hours per year. In summer, also due to the length of the days, the sunshine amount is quite good, and definitely better than in Norway. Here are the average sunshine hours per day.
Vaasa - Sunshine

The sea temperature ranges between -1 °C (30 °F) and 15 °C (59 °F). So, it is cold all year round. It is useful to recall that sea water freezes at about -2 °C (28.5 °F). Here are the average sea temperatures.
Vaasa - Sea temperature
Temp (°C)100138141512853
Temp (°F)343232343746575954464137


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.