Welcome to the Baltic Sea Ice Service

03.04.2025

In the Bay of Bothnia, there is 20–70 cm thick fast ice in the northern archipelagos and up to 35 cm thick, partly rotten fast ice in the southern archipelagos. At sea in the northeast, there is up to 60 cm thick, very close and partly ridged and rafted ice. The ice field gets compressed and is at places difficult to force. Else at sea it is mostly ice-free. In the Quark, there rotten ice in the inner archipelagos. The sea is ice-free. Along the coast of the northern Sea of Bothnia there is mostly rotten fast ice in inner bays. Along the southern coast it is ice-free. At the eastern and north-eastern coast of the Gulf of Finland, there is rotten ice in sheltered areas.