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Jul 01, 2026

Ocean surface temperatures hit record high as world enters ‘uncharted territory,’ scientists warn

173 million people under extreme heat alerts as fires rage out west01:49July 1, 2026, 7:01 AM EDT / Updated July 1, 2026, 7:36 AM EDTBy Chantal Da Silva

Temperatures on the ocean surface hit a record high in June, European scientists warned Wednesday, fueling fears of more dangerous heat waves this summer and fanning concerns over the escalating global climate crisis.

Two separate services under the European Union’s Copernicus earth observation program — the Copernicus Climate Change Service and the Copernicus Marine Service — announced they had both independently confirmed the record temperatures.

Carlo Buontempo, director of the Copernicus Copernicus Climate Change Service, warned that the rising temperatures could mark the “beginning of a new phase.”

“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 said in a statement Wednesday. El Niño is a naturally occurring climate cycle that sees the central and eastern tropical Pacific Ocean become warmer than usual for months at a time.

The world could be heading into “uncharted territory,” Buontempo warned.

Chicago Extreme Weather Heat
People enjoy the spray of cool water in front of a Chicago Fire Department on Tuesday.Nam Y. Huh / AP

According to Copernicus Climate Change Service and the Copernicus Marine Service, global ocean temperatures outside the polar regions hit record levels on June 21, surpassing levels for the time of the year observed in both 2023 and 2024.

The Copernicus Climate Change Service said temperatures reached 20.86 degrees Celsius, or 69.54 degrees Fahrenheit, that day, climbing above the 20.83 degrees Celsius, or 69.49 degrees Fahrenheit observed in 2023 and 2024.

The Copernicus Marine Service meanwhile recorded temperatures at 21 degrees Celsius, or 69.8 Fahrenheit, beating previous records from 2023 and 2024 by 0.1 degree Celsius.

“It’s consistent with what we’ve known for a long time — that the planet is warming because we’re emitting vast quantities of greenhouse gasses, primarily from fossil fuel burning, into the atmosphere and that’s stifling the ability of the planet to lose its heat to space,” Richard Allan, a professor of climate science at the University of Reading in the U.K., said in a phone interview.

People cool off along the lakefront as temperatures topped 90 degrees on June 29, 2026 in Chicago, Illinois.
Temperatures topped 90 degrees in Chicago on Monday.Scott Olson / Getty Images

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