---
title: "Global Sea Surface Temperature Hits Record 21.1°C"
publication: "MediaBias News"
url: "https://mediabias.news/climate/global-sea-surface-temperature-hits-record-211c"
api: "https://mediabias.news/api/v1/stories/global-sea-surface-temperature-hits-record-211c"
markdown: "https://mediabias.news/climate/global-sea-surface-temperature-hits-record-211c.md"
audio: "https://mediabias.news/api/audio/global-sea-surface-temperature-hits-record-211c"
category: "Climate"
published: "2026-08-24T19:45:45.534Z"
source_reported: "2026-08-24T19:17:18.000Z"
updated: "2026-08-24T19:45:45.534Z"
trust_score: 42
critic_score: 61
hype_score: 41
assessment_type: "coverage-and-source-reporting-analysis"
fact_check_status: "not-performed"
coverage_measured: "2026-08-24T21:00:06.682613+00:00"
---

# Global Sea Surface Temperature Hits Record 21.1°C

*Copernicus Climate Change Service reports new high, surpassing March 2024 record.*

**Scores for the source reporting** (0-100, assessing the original journalism this article was written from, not this write-up): 

- Trust 42 of 100, higher is better. Central claim attributed to Copernicus, a named body, with two independent outlets corroborating.
- Craft 61 of 100, higher is better. Reporting includes quotes from experts, explains consequences, and names specific data sources.
- Hype 41 of 100, lower is better. Headlines use strong language like 'unprecedented' and 'never before'.

Scored by MediaBias News; method at https://mediabias.news/methodology.

**The short version**

- The average global sea surface temperature reached 21.1°C on August 22, 2026.
- This new record surpasses the previous high of 21.09°C recorded in March 2024.
- Scientists attribute the record temperature to a combination of global warming and the El Niño phenomenon.
- The Mediterranean Sea also recorded a summer high of 33.02°C.

The average global sea surface temperature reached a record 21.1°C on August 22, 2026, according to the Copernicus Climate Change Service (C3S). This figure surpasses the previous record of 21.09°C, which was set in March 2024. The C3S reported that global ocean temperatures typically peak in March or April, making the August record unusual. This new high follows a series of monthly sea surface temperature records observed throughout 2026, indicating persistent warming.

Scientists attribute this record temperature to the combined effects of ongoing global warming and the El Niño phenomenon. The World Meteorological Organization anticipates El Niño will strengthen in the coming months. The Mediterranean Sea also experienced a record high this summer, reaching 33.02°C.

## Disagreement on previous record

While the Copernicus Climate Change Service reported the previous record was 21.09°C in March 2024, one report stated the previous high was 21.09°C in March 2024, and another mentioned a previous record of 20.98°C in 2023. One digest also noted the previous high was recorded in 2024.

## What the coverage left out

None of the digests mention the specific figure of 33.02°C for the Mediterranean Sea's record high temperature, which was only detailed in the full report from Eldiario.es.

## Who covered it

Shares of the 33 covering outlets with a published leaning rating:

- Left: 42% (14)
- Centre: 34% (11)
- Right: 24% (8)

31 of 64 covering outlets carried no usable leaning rating and were excluded from those percentages. Coverage measured 2026-08-24T21:00:06.682613+00:00.

**Coverage watch:** developing. Checked 6 times; 0 checks found a material change. Most recently checked 2026-08-24T21:15:09.373Z.

## How the sides framed it

### Left

- Eight of the 14 left-rated reports highlighted the record sea surface temperature and its connection to climate change and El Niño. Several reports quoted scientists on the unprecedented nature of the warming. Eldiario.es noted that ocean temperatures are rising at a 'dizzying speed' due to climate crisis and El Niño, and quoted Samantha Burgess, strategic climate lead at ECMWF, stating, 'This record is another clear sign that the ocean is under increasing pressure.' The outlet also detailed the consequences of warmer oceans, including sea-level rise and increased intensity of marine heatwaves. Le Huffington Post and HotNews.ro also noted the unusual timing of the record temperature.

### Centre

- Seven of the nine centre-rated reports focused on the record sea surface temperature and the alarm expressed by scientists. Staten Island Advance and Cleveland.com reported that scientists say the ocean warmth may rival levels not seen for thousands of years. Tagesschau and wz.de highlighted that climate experts find the timing of the measurement unusual. France24 and Euronews mentioned the record temperature and the potential for El Niño to be the most significant known.

### Right

- Six of the eight right-rated reports focused on the record sea surface temperature, attributing it to global warming and El Niño. Sapo and Observador reported the absolute record of 21.1°C on Saturday. Globo's headline stated that ocean temperature in 2026 is the highest already recorded. N-tv and Frankfurter Allgemeine mentioned El Niño as a reason, but not the only one. La Razón quoted a European expert stating the record is a 'clear sign that the ocean is under increasing stress'.

## Factuality profile of the covering outlets

These are published factuality ratings of the outlets, not a verdict on whether this story or its claims are true.

- mixed: 4
- high: 19
- unknown: 32
- veryHigh: 9

## Verification scope

This page compares coverage and scores the source reporting. It is not a ClaimReview verdict on whether the underlying event or claim is true.

## Original reporting this was written from

- [Staten Island Advance](https://silive.com/nation/2026/08/something-unusual-is-happening-beneath-the-oceans-surface-and-scientists-are-alarmed.html) — Earth’s oceans reach a milestone scientists say may be unprecedented in millennia
- [Cleveland](https://cleveland.com/news/2026/08/something-unusual-is-happening-beneath-the-oceans-surface-and-scientists-are-alarmed.html) — Earth’s oceans reach a milestone scientists say may be unprecedented in millennia
- [Spiegel](https://spiegel.de/wissenschaft/copernicus-messung-weltmeere-mit-21-1-grad-celsius-so-warm-wie-nie-a-fc8784fd-0aa0-487f-8e43-98e3c7dfadd4) — Copernicus Measurement: World Seas with 21.1 Degrees Celsius as Warm as Never Before
- [Gazeta.ua](https://gazeta.ua/articles/edu-and-science/_svitovij-okean-nagrivsya-do-rekordnih-211-c-vcheni-poperedzhayut-pro-zagrozu-dlya-planeti/1257253) — World Ocean Warms to Record 21.1°C: Scientists Warn of Threat to Planet
- [Live Science](https://livescience.com/planet-earth/climate-change/ocean-under-unprecedented-strain-as-el-nino-helps-supercharge-warming-to-record-levels) — Ocean 'under unprecedented strain' as El Niño helps supercharge warming to record levels
- [Le Huffington Post](https://huffingtonpost.fr/environnement/article/la-temperature-moyenne-journaliere-des-oceans-atteint-un-nouveau-record-la-responsabilite-d-el-nino-pointee_311258.html) — The Oceans No Longer End up Heating and Are Beating a New Sad Temperature Record
- [Rzeczpospolita](https://klimat.rp.pl/klimat/art45046821-temperatura-morz-i-oceanow-najwyzsza-w-historii-skutki-dosiegna-tez-polske) — Sea and Ocean Temperatures Are at Their Highest Point in History. The Effects Will Also Reach Poland.
- [El Economista](https://eleconomista.com.mx/internacionales/temperatura-media-diaria-superficie-mar-registra-nuevo-record-21-1-grados-celsius-20260824-829879.html) — The Average Daily Temperature of the Sea Surface Records a New Record of 21.1 Degrees Celsius
- [Stéphane Larue](https://stephanelarue.com/rechauffement-climatique-les-oceans-atteignent-un-record-absolu-a-211-c) — Climate Warming: the Oceans Reach an Absolute Record at 21.1°C
- [www.cnews.fr](https://cnews.fr/environnement/2026-08-24/les-oceans-ont-atteint-une-temperature-record-ce-week-end-1908861) — The Oceans Have Reached a Record Temperature This Weekend
- [rtl.lu](https://rtl.lu/news/international/mierer-uechter-dwelt-esou-waarm-wei-nach-ni-2071123118) — Copernicus Warns Viru Risks: Mierer Uechter d'Welt Esou Waarm Wéi Nach Ni
- [Sapo](https://jornaleconomico.sapo.pt/noticias/temperatura-dos-oceanos-registou-recorde-absoluto-de-211-oc-no-sabado-segundo-copernicus) — Ocean Temperature Recorded an Absolute Record of 21.1 oC on Saturday, According to Copernicus.
- [BBC News](https://bbc.com/news/articles/c62m4gpnp78o) — World's oceans hit highest temperature on record as El Niño grows
- [Le Grand Continent](https://legrandcontinent.eu/fr/2026/08/24/les-oceans-ont-atteint-leur-temperature-la-plus-elevee-jamais-enregistree) — The Oceans Have Reached Their Highest Temperature
- [pmo.ee](https://pmo.ee/8533345) — EL NIÑO INFLUENCE ⟩ New Record Surface Temperature Measured in the World's Oceans
- [Hot News](https://hotnews.ro/oceanele-lumii-au-inregistrat-un-record-zilnic-absolut-de-caldura-de-ce-este-neobisnuita-o-astfel-de-temperatura-acum-2332176) — The World's Oceans Have Recorded an Absolute Daily Record of Heat. Why Such a Temperature Is Unusual Now - HotNews.ro
- [Moneycab](https://moneycab.com/klima-umwelt/meerestemperaturen-so-hoch-wie-noch-nie-seit-messbeginn) — Sea Temperatures as High as Never Before Since the Beginning of the Measurement
- [Radio France](https://radiofrance.fr/franceinter/podcasts/l-info-de-france-inter/copernicus-6412720) — Climate Change: the Temperature of the Oceans Broke a New Record This Summer
- [Meduza](https://meduza.io/news/2026/08/24/mirovoy-okean-poteplel-do-rekordnoy-temperatury-21-1-gradusa-predyduschiy-maksimum-fiksirovali-v-2024-godu) — The World's Oceans Have Warmed to a Record Temperature of 21.1 Degrees. The Previous Maximum Was Recorded in 2024
- [Tagesschau](https://tagesschau.de/wissen/weltmeere-rekordtemperatur-100.html) — EU Climate Service Copernicus: 21.1 Degrees - World Oceans Warmer than Ever
- [Globo](https://oglobo.globo.com/mundo/noticia/2026/08/24/temperatura-dos-oceanos-em-2026-e-a-mais-alta-ja-registrada-aponta-servico-de-mudancas-climaticas-da-uniao-europeia.ghtml) — Ocean Temperature in 2026 Is the Highest Already Recorded, Points to EU Climate Change Service
- [RTS](https://rts.ch/info/environnement/2026/article/oceans-la-temperature-des-eaux-atteint-le-record-de-21-1-c-29336789.html) — Oceans: Water Temperature Reaches a Record 21.1°C
- [IOL Portugal](https://cnnportugal.iol.pt/alteracoes-climaticas/temperaturas/temperatura-dos-oceanos-registou-recorde-absoluto-de-21-1-c-no-sabado/20260824/6a8c50d7d34ed0733ba8161f) — Ocean Temperature Recorded Absolute Record of 21.1 oC on Saturday
- [Liberation](https://liberation.fr/environnement/climat/la-temperature-moyenne-des-oceans-mondiaux-bat-un-record-historique-a-211-c-20260824_27PJSYOTERBRDG5EPJT7O5HQTQ) — The Average Temperature of the World's Oceans Is Setting a Historic Record at 21.1°C
- [tvrain.tv](https://tvrain.tv/news/voda-v-mirovom-okeane-progrelas-do-rekordnogo-urovnja-575180) — The Water in the Oceans Has Warmed to Record Levels.
- [Observador](https://observador.pt/2026/08/24/temperatura-dos-oceanos-registou-recorde-absoluto-de-211-oc-no-sabado) — Ocean Temperature Recorded Absolute Record of 21.1 oC on Saturday
- [n-tv](https://n-tv.de/wissen/Meerestemperaturen-so-hoch-wie-noch-nie-id31226871.html) — Sea Temperatures as High as Never Before
- [Sud Ouest](https://sudouest.fr/environnement/climat/rechauffement-climatique/climat-les-oceans-mondiaux-ont-enregistre-un-nouveau-record-de-temperature-moyenne-journaliere-30354331.php) — Climate: the World's Oceans Have Recorded a New Average Daily Temperature Record
- [Reporterre, le quotidien de l'écologie…](https://reporterre.net/La-temperature-moyenne-a-la-surface-des-oceans-vient-de-battre-un-nouveau-record) — The Average Temperature at the Surface of the Oceans Has Just Broken a New Record
- [O Minho](https://ominho.pt/temperatura-dos-oceanos-registou-recorde-absoluto-de-211-oc-no-sabado) — Ocean Temperature Recorded Absolute Record of 21.1 oC on Saturday
- [Radio-Canada](https://ici.radio-canada.ca/nouvelle/2277283/oceans-chaleur-temperature-record) — The Oceans Record Their Warmest Day
- [onetz.de](https://onetz.de/deutschland-welt/copernicus-weltmeere-so-warm-noch-nie-id5479188.html) — Copernicus: World Seas as Warm as Never Before
- [wz.de](https://wz.de/panorama/wissenschaft/copernicus-weltmeere-so-warm-wie-noch-nie_aid-153648237) — Copernicus: World Seas as Warm as Never Before
- [MARINE & OCÉANS](https://marine-oceans.com/actualites/les-oceans-mondiaux-ont-enregistre-samedi-un-record-de-temperature-moyenne-journaliere-a-211c) — On Saturday, the World's Oceans Recorded an Average Daily Temperature Record at 21.1°C.
- [Le Singulier](https://lesinguliersete.fr/oceans-en-surchauffe-un-record-absolu-qui-inquiete) — Oceans Overheated, an Absolute Record that Worries
- [iDNES.cz](https://idnes.cz/zpravy/zahranicni/more-oteplovani-klima-rekord.A260824_142129_zahranicni_dtt) — World's Oceans Are the Warmest in History, Risks Are Rising. One Thing Surprised Scientists
- [n1info.rs](https://n1info.rs/zeleni-kutak/okeani-nikad-topliji-rekord-izmeren-u-avgustu-podstice-poplave-i-razorne-oluje) — Oceans Never Warmer - Record Measured in August Fuels Flooding and Devastating Storms
- [Vísir](https://visir.is/g/20262925322d/heims-hofin-aldrei-heitari) — The World's Oceans Have Never Been Warmer
- [France24](https://france24.com/fr/info-en-continu/20260824-les-oc%C3%A9ans-mondiaux-ont-enregistr%C3%A9-samedi-un-record-de-temp%C3%A9rature-moyenne-journali%C3%A8re-%C3%A0-21-1%C2%B0c) — On Saturday, the World's Oceans Recorded an Average Daily Temperature Record at 21.1°C.
- [Euronews](https://euronews.com/2026/08/24/worlds-oceans-hit-hottest-temperature-ever-recorded-in-august-as-el-nino-takes-hold) — World's oceans hit hottest temperature ever recorded in August
- [Noticias ao Minuto](https://noticiasaominuto.com/mundo/3040660/temperatura-dos-oceanos-registou-recorde-absoluto-de-21-1-c-no-sabado) — Ocean Temperature Recorded Absolute Record of 21.1 oC on Saturday
- [SIC Notícias](https://sicnoticias.pt/especiais/alteracoes-climaticas/2026-08-24-oceanos-batem-novo-recorde-de-temperatura-ao-atingir-media-de-211c-10d009f5) — Oceans Hit a New Temperature Record at an Average of 21.1oC
- [LaProvence.com](https://laprovence.com/article/france-monde/5571538253287114/les-oceans-mondiaux-ont-enregistre-samedi-un-record-de-temperature-moyenne-journaliere-a-21-1-c) — On Saturday, the World's Oceans Recorded an Average Daily Temperature Record at 21.1°C.
- [La Libre](https://lalibre.be/planete/environnement/2026/08/24/la-temperature-des-oceans-atteint-un-record-absolu-un-nouveau-signal-alarmant-du-rechauffement-climatique-YGYV467EK5H77PM744J5KBESPM) — The Temperature of the Oceans Reaches an Absolute Record: an Alarming New Signal of Global Warming
- [elDiarioAR](https://eldiarioar.com/sociedad/temperatura-oceano-marca-nuevo-record-absoluto-empujada-nino-hemos-visto_1_13464052.html) — Ocean Temperature Marks a New Absolute Record Pushed by El Niño: “We’ve Never Seen Anything Like It”
- [Publico](https://publico.pt/2026/08/24/azul/noticia/temperatura-oceano-superficie-atinge-novo-maximo-historico-pleno-mes-agosto-2185926) — Ocean Surface Temperature Hits New Record in Mid-August
- [Folha de S.Paulo](https://redir.folha.com.br/redir/online/emcimadahora/rss091/*https://www1.folha.uol.com.br/ambiente/2026/08/com-el-nino-dia-mais-quente-da-historia-em-oceanos-e-registrado-pelo-copernicus.shtml) — With El Niño, Oceans Have the Hottest Day of History - 24/08/2026 - Environment
- [Frankfurter Allgemeine](https://faz.net/aktuell/wissen/erde-klima/weltmeere-auf-rekordhoch-copernicus-misst-21-1-grad-accg-201154877.html) — World Seas at Record High: Copernicus Measures 21.1 Degrees
- [Sueddeutsche Zeitung](https://sueddeutsche.de/wissen/rekord-meerestemperatur-klimawandel-el-nino-li.3536123) — Climate Change: Sea Temperatures as High as Ever
- [franceinfo.fr](https://franceinfo.fr/environnement/crise-climatique/les-oceans-mondiaux-atteignent-un-record-de-temperature-moyenne-journaliere-a-21-1-c_8159651.html) — The World's Oceans Reach a Record Daily Average Temperature at 21.1°C
- [La Razón](https://larazon.es/sociedad/temperatura-mar-rompe-maximo-historico-mundial-alcanza-211c_202608246a8c3a837b9bc81c9ed72fc8.html) — The Temperature of the Sea Breaks Its World Historical Peak and Reaches 21.1oC
- [El Pais](https://elpais.com/clima-y-medio-ambiente/2026-08-24/los-oceanos-del-planeta-registran-la-temperatura-mas-alta-desde-que-hay-datos.html) — The Oceans of the Planet Record the Highest Temperature Since Data
- [Scientific American](https://scientificamerican.com/article/earths-oceans-just-hit-their-hottest-temperature-ever-recorded) — Earth's oceans just hit their hottest temperature ever recorded
- [Novinky.cz](https://novinky.cz/clanek/pocasi-teplota-oceanu-dosahla-historickeho-rekordu-dusledky-mohou-byt-vazne-40594142) — Ocean Temperatures Have Reached a Historic High. The Consequences Could Be Serious
- [The Hindu Business Line](https://thehindubusinessline.com/economy/agri-business/global-sea-surface-temperature-breaks-record-as-el-nino-gains-strength/article71384216.ece) — Global Sea Surface Temperature breaks record as El Nino gains strength
- [efeverde.com](https://efeverde.com/la-temperatura-maxima-diaria-del-mar-alcanza-un-nuevo-record-211-c-el-22-de-agosto) — The Maximum Daily Temperature of the Sea Reaches a New Record: 21.1 °C on August 22
- [inFranken.de](https://infranken.de/ueberregional/newsticker-national/wissenschaft/copernicus-weltmeere-so-warm-wie-noch-nie-art-6390660) — Copernicus: World Seas as Warm as Never Before
- [Anadolu Ajansı](https://aa.com.tr/en/environment/global-sea-surface-temperature-hits-record-high-of-211c-eu-climate-agency/4035799) — Global sea surface temperature hits record high of 21.1C: EU climate agency
- [Eldiario.es](https://eldiario.es/sociedad/temperatura-oceano-marca-nuevo-record-absoluto-empujada-nino-hemos-visto_1_13463608.html) — Ocean Temperature Marks a New Absolute Record Pushed by El Niño: “We’ve Never Seen Anything Like It”
- [Il Messaggero](https://ilmessaggero.it/scienza/mare_temperatura_record_perche_cosa_sappiamo-9723018.html) — Sea Never so Hot, New Temperature Record: over 21° on August 22. Here's What's Behind, the Effects of El Nino Extreme
- [The Fishing Daily - Irish Fishing Industry News](https://thefishingdaily.com/international-fishing-news/ocean-temperature-record-raises-fresh-fisheries-concerns) — Ocean Temperature Record Raises Fresh Fisheries Concerns - International Fishing News - The Fishing Daily - Irish, UK and European Fishing Industry News
- [Hospodárske Noviny](https://hnonline.sk/science/klima-a-fyzika/96298487-svetove-moria-su-najteplejsie-v-historii-merani-dosledky-su-viditelne-uz-teraz-hovoria-vedci) — World's Oceans Are the Warmest on Record. The Consequences Are Already Visible, Scientists Say
- [La Presse](https://lapresse.ca/actualites/environnement/2026-08-24/les-oceans-ont-enregistre-samedi-un-record-de-temperature-moyenne.php) — The Oceans Recorded a Record Average Temperature on Saturday
- [Aftonbladet](https://aftonbladet.se/nyheter/klimat/a/0pXJRG/varldens-hav-rekordvarma-vid-ovanlig-tid-pa-aret) — World's Oceans Record Warm at Unusual Time of Year

## Questions

**What was the record global sea surface temperature?**

The average global sea surface temperature reached a record 21.1°C on August 22, 2026. This surpassed the previous record of 21.09°C set in March 2024.

**What is causing the record ocean temperatures?**

Scientists attribute the record ocean temperatures to a combination of global warming and the El Niño phenomenon. El Niño is expected to strengthen in the coming months.

**Did any other bodies of water set temperature records?**

Yes, the Mediterranean Sea also reached a record high this summer, recording a temperature of 33.02°C.

---

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