Climate change

Report: World's Oceans Experience Hottest June Ever

Is this a climate emergency demanding action or just normal variation in Earth's geological history?

Published JUL 1

Report: World's Oceans Experience Hottest June Ever

Story

Above: People swim in the sea at Bebek beach seeking relief from the hot weather in Istanbul on July 1. Image credit: Mustafa Mert Karaca/Anadolu/Getty Images

The Facts

The European Union's Copernicus Marine Service reported on Wednesday that global ocean surface temperatures outside the polar regions reached a record high of 21°C (69.8°F) on June 21, surpassing the previous high set in 2024.
Copernicus
NBC
Financial Times
Global average sea surface temperatures for the full month of June reached 20.98°C, capping six months of near-unprecedented ocean warmth and surpassing records set in 2023 and 2024.
Copernicus on X
The Straits Times
EuroNews
Marine heatwaves affected around 82% of the world's oceans in the first half of 2026, the second-largest extent on record after 2024, while the Mediterranean broke its June record, reaching 24.3°C and surpassing previous highs set in 2023 and 2025.
Copernicus
The Straits Times
AFP News Agency on X
Scientists attribute the record sea surface temperatures to the onset of El Niño conditions in the equatorial Pacific, announced by the World Meteorological Organization on June 2, combined with long-term warming driven by greenhouse gas emissions from fossil fuels.
CNN
Daily Mail
World Meteorological Organization
Over the past three years, ocean temperatures outside the polar regions have been between 0.35 and 0.73°C above the long-term average. Scientists say a strong El Niño could push global temperatures to new records in 2026 and into 2027.
CNN
The Straits Times
guardian
According to Copernicus scientists, warmer oceans keep the atmosphere warmer for longer, supply extra energy to storms, increase evaporation and contribute to sea level rise, ice melt and stress on marine ecosystems.
Copernicus
Daily Mail
EuroNews

Sources Split

LEFT

CENTER

RIGHT

ESTAB
CRIT

CENTER

PRO
ESTAB

The Spin

Climate-concerned narrative

Ocean temperatures just shattered records that scientists already called terrifying, and the government's response is to greenlight more oil drilling. That's willful negligence in the face of a worsening crisis. Record-breaking heat in the oceans demands urgent action, not expanded fossil fuel extraction.

Adrian Ramsay on X

Climate-skeptic narrative

Earth's current temperatures are actually among the coldest in geological history — the planet has spent most of the last 541 million years running 5-10°C hotter than today. Orbital mechanics drive the big climate shifts, and humanity evolved entirely within an ice age. Calling today's baseline a planetary emergency ignores the deep geological record.

Peter Clack on X