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Water temperatures in the North Sea this spring hit their highest level ever recorded by Germany鈥檚聽Federal Maritime and Hydrographic Agency (BSH). The average temperature of 8.7掳C topped the long-term average by 0.9掳C. 鈥淭he whole North Sea is experiencing the warmest spring since the beginning of analyses in 1997,"聽聽the BSH, adding that temperatures in the Baltic Sea had also hit record levels in early 2025. The BSH said the high average temperatures are 鈥渁nother sign of ongoing climate change鈥�, pointing out that extreme heat waves can also occur as a marine phenomenon.

In waters of the northern German city of Kiel on the Baltic Sea, a heatwave which saw the near-surface water temperature hit the top-ten percent of the past 30 years lasted for a record 55 days, from 28 March to 21 May, the agency added. 鈥淭he temperatures during the heatwave were 2.6掳C above the 1991-2020 average, with a peak of 4.3掳C above average,鈥� said BSH climate scientist Claudia Hinrichs.

Temperature variations differed locally, the agency added. The greatest divergences occurred in the eastern North Sea, off the coasts of Norway and Denmark, where temperatures were about 2掳C above the long-term average.聽In Germany鈥檚 territorial waters, temperatures were 1.5掳C degrees higher.聽In the Baltic Sea, the northern portion near Sweden and Finland was colder than the long-term average, while the south-western portion around Germany and Denmark was 2掳C warmer.聽