Helsinki is located on the gulf of Finland in southern Finland. Despite its northerly location, Helsinki isn't as cold as you might think, especially in summer. In the second half of June there are 19 hours of sunlight.
Helsinki starts warming up in April. The best time to go--June through August--offers average high temperatures near 70. The weather is very changeable.
May offers the fewest days of rainfall expected, which may make it an option for folks that don't mind cooler weather.
By the end of September coolness sets in and the colors of autumn foliage appear.
Winters in Helsinki are long and cold--avoid November through March if you mind the chill. On the other hand, when the winter is particularly cold, the Northern Lights or Aurora Borealis that can be seen in Northern Finland may be seen in Helsinki as well.
The climate charts below show the historic high and low temperatures and average monthly rainfall for Helsinki, Finland.
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