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'Beginning of a New Phase': Hottest June Ever Recorded for World's Oceans
"With ocean temperatures at these levels and El Niño on the horizon, we are likely to see more temperature records fall in the coming months."
Jul 01, 2026
A new report released Wednesday shows that surface temperatures of the world's oceans hit a record for June, sparking fresh warnings of grave “consequences for weather patterns, global climate and marine ecosystems” across the globe.
The analysis by the European Union’s Copernicus Marine Service, and confirmed by the Copernicus Climate Change Service (C3S), finds that “record global sea surface temperatures” of 21.0° Celsius (69.8° Fahrenheit) in June of 2026 beat the previous record in the same month broken in 2023 and again in 2024.
C3S director Carlo Buontempo warned that the "current conditions" of the oceans "could indicate the beginning of a new phase, leading, once more, to uncharted territory."
"With ocean temperatures at these levels and El Niño on the horizon, we are likely to see more temperature records fall in the coming months," Buontempo warned. "That Copernicus Marine data reaches the same conclusion through independent methods speaks to the strength of European science—and to why open, robust data matters now more than ever.”
According to a statement from Copernicus, warmer oceans have wide-ranging impacts on natural systems and human infrastructure, noting that "higher ocean temperatures keep the atmosphere warm for longer, provide extra energy to storms and increase evaporation, thus enhancing the potential for extreme precipitation and flooding. Ocean warming also contributes to sea level rise and ice melt, and stresses marine ecosystems."
With the onset of a new El Niño cycle—which tends to trigger more pronounced weather events worldwide—the continued increase of ocean temperatures is a serious concern of scientists.
Wednesday's report on ocean temperatures also arrives as record-breaking heat waves hit both Europe and North America, offering more evidence of the perils of an ever-hotter world that is being pushed to the brink by the burning of fossil fuels and the failure of governments worldwide to finally act against the fossil fuel industry that is driving the crisis.
Surging ocean surface temperatures are "not unexpected,” Michael Meredith, an ocean scientist at the British Antarctic Survey, told CNN in response to the Copernicus report. “But the pace of warming we are now seeing is alarming.”
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A new report released Wednesday shows that surface temperatures of the world's oceans hit a record for June, sparking fresh warnings of grave “consequences for weather patterns, global climate and marine ecosystems” across the globe.
The analysis by the European Union’s Copernicus Marine Service, and confirmed by the Copernicus Climate Change Service (C3S), finds that “record global sea surface temperatures” of 21.0° Celsius (69.8° Fahrenheit) in June of 2026 beat the previous record in the same month broken in 2023 and again in 2024.
C3S director Carlo Buontempo warned that the "current conditions" of the oceans "could indicate the beginning of a new phase, leading, once more, to uncharted territory."
"With ocean temperatures at these levels and El Niño on the horizon, we are likely to see more temperature records fall in the coming months," Buontempo warned. "That Copernicus Marine data reaches the same conclusion through independent methods speaks to the strength of European science—and to why open, robust data matters now more than ever.”
According to a statement from Copernicus, warmer oceans have wide-ranging impacts on natural systems and human infrastructure, noting that "higher ocean temperatures keep the atmosphere warm for longer, provide extra energy to storms and increase evaporation, thus enhancing the potential for extreme precipitation and flooding. Ocean warming also contributes to sea level rise and ice melt, and stresses marine ecosystems."
With the onset of a new El Niño cycle—which tends to trigger more pronounced weather events worldwide—the continued increase of ocean temperatures is a serious concern of scientists.
Wednesday's report on ocean temperatures also arrives as record-breaking heat waves hit both Europe and North America, offering more evidence of the perils of an ever-hotter world that is being pushed to the brink by the burning of fossil fuels and the failure of governments worldwide to finally act against the fossil fuel industry that is driving the crisis.
Surging ocean surface temperatures are "not unexpected,” Michael Meredith, an ocean scientist at the British Antarctic Survey, told CNN in response to the Copernicus report. “But the pace of warming we are now seeing is alarming.”
A new report released Wednesday shows that surface temperatures of the world's oceans hit a record for June, sparking fresh warnings of grave “consequences for weather patterns, global climate and marine ecosystems” across the globe.
The analysis by the European Union’s Copernicus Marine Service, and confirmed by the Copernicus Climate Change Service (C3S), finds that “record global sea surface temperatures” of 21.0° Celsius (69.8° Fahrenheit) in June of 2026 beat the previous record in the same month broken in 2023 and again in 2024.
C3S director Carlo Buontempo warned that the "current conditions" of the oceans "could indicate the beginning of a new phase, leading, once more, to uncharted territory."
"With ocean temperatures at these levels and El Niño on the horizon, we are likely to see more temperature records fall in the coming months," Buontempo warned. "That Copernicus Marine data reaches the same conclusion through independent methods speaks to the strength of European science—and to why open, robust data matters now more than ever.”
According to a statement from Copernicus, warmer oceans have wide-ranging impacts on natural systems and human infrastructure, noting that "higher ocean temperatures keep the atmosphere warm for longer, provide extra energy to storms and increase evaporation, thus enhancing the potential for extreme precipitation and flooding. Ocean warming also contributes to sea level rise and ice melt, and stresses marine ecosystems."
With the onset of a new El Niño cycle—which tends to trigger more pronounced weather events worldwide—the continued increase of ocean temperatures is a serious concern of scientists.
Wednesday's report on ocean temperatures also arrives as record-breaking heat waves hit both Europe and North America, offering more evidence of the perils of an ever-hotter world that is being pushed to the brink by the burning of fossil fuels and the failure of governments worldwide to finally act against the fossil fuel industry that is driving the crisis.
Surging ocean surface temperatures are "not unexpected,” Michael Meredith, an ocean scientist at the British Antarctic Survey, told CNN in response to the Copernicus report. “But the pace of warming we are now seeing is alarming.”
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