Temperatures in Finland last month were between 1.5 and 3.5 degrees Celsius warmer than normal in most parts of the country.
Southern parts of the country can expect showers and thunderstorms on Tuesday, with more severe storms possibly hitting central areas by evening.
The last time the water levels were this high in some places was in the late 1990s or early 2000s. According to the Finnish Environment Institute (Syke), floodwaters will likely spill onto fields and roads in parts of southern and western Finland, but not into buildings.
The last time Finland had this much sunshine in March was nearly a decade ago, in 2013. High pressure typically brings clear skies, and this was also the case last month in Finland.
Conditions will heat up with every passing day and weekend highs will be in the 20s across the country.
Helsinki usually gets 70-80 millimetres of rain during August. Friday morning alone brought 56 mm of water to Kaisaniemi Park, where the Finnish Meteorological Institute (FMI) has a weather station.
The northwest coastal city of Oulu was one of several that had over 30-degree Celsius temperatures on Friday.
The state rail company VR has said that it will substitute buses on some of the cancelled rail trips.
The Finnish researcher says the source of southern Finland's unusually slippery roads and messy snow this winter is very likely due to warm air from the sea.
Rain and rising temperatures have brought warnings of extremely slippery conditions in other areas.
High winds blasted across south-western Finland Friday, cutting electricity to customers. The rare June storm peaked on Friday afternoon.
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