The climate in Southern Finland is a northern temperate climate. In Northern Finland, particularly in the Province of Lapland, a subarctic climate dominates, characterised by cold, occasionally severe, winters and relatively warm summers. Finland is near enough to the Atlantic to be continuously warmed by the Gulf Stream, which explains the unusually warm climate considering the absolute latitude.

A quarter of Finland's territory lies above the Arctic Circle, and as a consequence the midnight sun can be experienced — for more and more days, the further up north one comes. At Finland's northernmost point, the sun does not set for 73 days during summer, and does not rise at all for 51 days in winter.