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yesterday

Germany Confirms Record 2025 North Sea Heat, Near-Record Baltic Warmth

Officials attribute the extremes to climate change, warning of rising coastal risk.

Menschen spazieren bei starker Brandung an einem Strand.
Image
Die Nordsee ist 2025 so warm wie nie zuvor seit Beginn der Messungen gewesen. Es wurde der höchste Wert seit Aufzeichnungsbeginn 1969 erreicht, wie das Bundesamt für Seeschifffahrt und Hydrographie in Hamburg mitteilte.
Nord- und Ostsee erreichen 2025 Rekordtemperaturen, bedingt durch den Klimawandel.

Overview

  • The North Sea averaged 11.6°C in 2025, the highest since records began in 1969, sitting 0.9°C above the 1997–2021 mean with every month above average and new highs in June and December.
  • Total heat content in the North Sea reached an unprecedented 1.46 million petajoules, indicating warming throughout the entire water column.
  • The Baltic Sea averaged 9.7°C, its second-warmest year since 1990, with the strongest anomalies in the southwest Baltic and the Gulf of Finland.
  • Marine heatwaves intensified, including a record 55-day event in the Kiel Fjord with temperatures averaging 2.6°C above normal and peaking 4.3°C higher.
  • The BSH links the findings to climate change, cites long-term sea-level rise of over 25 cm at Cuxhaven and about 20 cm at Warnemünde, and with DMI projects further warming without sharp emissions cuts.