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Highest-ever ocean temperature recorded as super El Nino forms

The global average sea-surface temperature reached a record 21.1°C on August 22, according to Copernicus. Scientists attribute the spike to a combination of human-driven warming and a powerful El Niño, warning of increased risks to marine ecosystems and coastal communities.

By Tertius News AI Desk 2 outlets · 2 articles Version 1 Coverage Aug 25, 2026 Published 8h ago

Record ocean temperature

The global average sea-surface temperature reached a record 21.1 degrees Celsius on August 22, according to Europe's Earth observation agency Copernicus, which has been tracking the metric daily since 1979. The previous single-day record of 21.09 degrees Celsius was measured in March 2024.

Scientists said the record reflects the combined effects of climate change and a powerful El Niño in the tropical Pacific. "El Niño is adding heat to the system, but it is doing so on top of decades of human-driven warming," said Samantha Burgess, strategic lead for climate at Copernicus' European Centre for Medium-Range Weather Forecasts.

Rising risks

Burgess warned that "as ocean temperatures continue to rise, the risks to marine ecosystems and coastal communities also increase." Warmer oceans contribute to sea level rise and increase the chance of extreme weather events, as warmer water transfers more heat and moisture to the atmosphere, intensifying storms and heat on land. Additionally, warmer oceans have a reduced capacity to absorb carbon dioxide.

Context and outlook

Record temperatures have already been measured in isolated areas of the world's oceans, including the western Mediterranean Sea and at Earth's poles, driven mainly by human-made climate change. Copernicus expects the trend to continue, with ocean temperatures now being supercharged by El Niño.

The August record is particularly worrying because global ocean temperatures are typically highest in March and April, after the Austral summer, Copernicus said.

How each outlet told it

The Japan Times as of Aug 25, 2026, 2:16 AM UTC

Framing: Headline emphasizes the record ocean temperature and the formation of a 'super' El Nino, mirroring similar wording. — Measured with a note of concern: Casts the August record as 'particularly worrying' with an explanation, adding a cautionary layer beyond pure reporting.

Facts Included:

Global average sea-surface temperature hit a record 21.1°C on Aug. 22, according to Copernicus.
Previous single-day record was 21.09°C in March 2024.
Copernicus has tracked the metric daily since 1979.
Samantha Burgess, strategic lead for climate at Copernicus' European Centre for Medium-Range Weather Forecasts, said: 'El Nino is adding heat to the system, but it is doing so on top of decades of human-driven warming.'
Burgess said: 'As ocean temperatures continue to rise, the risks to marine ecosystems and coastal communities also increase.'
Higher ocean temperatures contribute to sea level rise and increase chance of extreme weather events.
Warmer oceans have reduced capacity to absorb carbon dioxide.
Record temperatures have been measured in isolated areas including the western Mediterranean Sea and Earth's poles, driven mainly by human-made climate change.
Copernicus expects the trend to continue, with ocean temperatures supercharged by El Nino.
August record is particularly worrying because global ocean temperatures are typically highest in March and April after the Austral summer.

Read the source article →

South China Morning Post as of Aug 25, 2026, 2:45 AM UTC

Framing: Headline emphasizes the record ocean temperature and the formation of a 'super' El Nino, combining climate change with a powerful El Nino. — Measured: Describes a record and potential risks without alarmist language, using phrases like 'risks to marine ecosystems and coastal communities also increase.'

Facts Included:

Global average sea-surface temperature hit a record 21.1°C on August 22, according to Copernicus.
Previous single-day record was 21.09°C in March 2024.
Copernicus has tracked the metric daily since 1979.
Samantha Burgess, strategic lead for climate at Copernicus' European Centre for Medium-Range Weather Forecasts, said: 'El Nino is adding heat to the system, but it is doing so on top of decades of human-driven warming.'
Burgess also said: 'As ocean temperatures continue to rise, the risks to marine ecosystems and coastal communities also increase.'
Higher ocean temperatures contribute to sea level rise and increase chance of extreme weather events.
Warmer oceans have reduced capacity to absorb carbon dioxide.

Read the source article →

What was claimed, and who backed it

Each row is one claim, attributed to the outlet whose wording states it most clearly. Confidence rates how directly the source text states the claim — explicit and unhedged rates high; hedged, pieced-together, or internally inconsistent statements rate lower. It does not measure whether the claim is true. Status counts the distinct outlets we found asserting it — so a single-source claim can still show high confidence, and a multi-source claim can show medium. Every one of those outlets is named beside the status, so you can check the count against the list. For claims extracted before we began storing that list, the row says so: it names the outlet the claim is quoted from and states that we have not recorded which outlets backed it. Outlets wrote at different times, so a figure that evolves — a casualty count, for example — can legitimately differ between rows; check the "as of" time next to each claim's source.

Claim	Confidence	Status
ClaimScientists have recorded the highest temperature ever measured in the world's oceans.	ConfidenceHigh	StatusMulti-source (2 outlets) via South China Morning Post as of Aug 25, 2026, 2:45 AM UTC, The Japan Times as of Aug 25, 2026, 2:16 AM UTC
ClaimThe global average sea-surface temperature hit a record 21.1 degrees Celsius on August 22, according to Copernicus.	ConfidenceHigh	StatusMulti-source (2 outlets) via South China Morning Post as of Aug 25, 2026, 2:45 AM UTC, The Japan Times as of Aug 25, 2026, 2:16 AM UTC
ClaimThe previous single-day record for global average sea-surface temperature was 21.09 degrees Celsius, measured in March 2024.	ConfidenceHigh	StatusMulti-source (2 outlets) via South China Morning Post as of Aug 25, 2026, 2:45 AM UTC, The Japan Times as of Aug 25, 2026, 2:16 AM UTC
ClaimCopernicus has tracked the global average sea-surface temperature metric daily since 1979.	ConfidenceHigh	StatusMulti-source (2 outlets) via South China Morning Post as of Aug 25, 2026, 2:45 AM UTC, The Japan Times as of Aug 25, 2026, 2:16 AM UTC
ClaimSamantha Burgess, strategic lead for climate at Copernicus' European Centre for Medium-Range Weather Forecasts, said: 'El Nino is adding heat to the system, but it is doing so on top of decades of human-driven warming.'	ConfidenceHigh	StatusMulti-source (2 outlets) via South China Morning Post as of Aug 25, 2026, 2:45 AM UTC, The Japan Times as of Aug 25, 2026, 2:16 AM UTC
ClaimSamantha Burgess said: 'As ocean temperatures continue to rise, the risks to marine ecosystems and coastal communities also increase.'	ConfidenceHigh	StatusMulti-source (2 outlets) via South China Morning Post as of Aug 25, 2026, 2:45 AM UTC, The Japan Times as of Aug 25, 2026, 2:16 AM UTC
ClaimHigher ocean temperatures contribute to sea level rise and increase the chance of extreme weather events, as warmer water transfers more heat and moisture to the atmosphere, intensifying storms and heat on land.	ConfidenceHigh	StatusMulti-source (2 outlets) via South China Morning Post as of Aug 25, 2026, 2:45 AM UTC, The Japan Times as of Aug 25, 2026, 2:16 AM UTC
ClaimWarmer oceans have a reduced capacity to absorb carbon dioxide.	ConfidenceHigh	StatusMulti-source (2 outlets) via South China Morning Post as of Aug 25, 2026, 2:45 AM UTC, The Japan Times as of Aug 25, 2026, 2:16 AM UTC
ClaimRecord temperatures have already been measured in isolated areas of the world's oceans, including the western Mediterranean Sea and at Earth's poles.	ConfidenceHigh	StatusSingle-source via The Japan Times as of Aug 25, 2026, 2:16 AM UTC
ClaimCopernicus expects the trend of rising ocean temperatures to continue, with ocean temperatures now being supercharged by El Nino.	ConfidenceMedium	StatusSingle-source via The Japan Times as of Aug 25, 2026, 2:16 AM UTC
ClaimThe August record is particularly worrying because global ocean temperatures are typically highest in March and April, after the Austral summer, Copernicus said.	ConfidenceHigh	StatusSingle-source via The Japan Times as of Aug 25, 2026, 2:16 AM UTC

Transparency & Audit Trail

2 outlets · 2 articles consulted: The Japan Times, South China Morning Post 11 claims extracted Version 1 Written 2026-08-25