Record warmth swept across the Antarctic Peninsula this month. Temperatures climbed above 15 degrees Celsius in June. That is winter on the frozen continent. Scientists called the readings very strange. The anomaly exceeded 20 degrees Celsius above normal. It broke the previous June high set in 1998 by two full degrees.
The Argentinian Esperanza base on the Trinity peninsula logged the peak of 15.4 degrees Celsius on June 6. Maximum daily temperatures stayed above zero for three straight weeks. This was no fleeting spike. It formed part of a stubborn heatwave. And the effects appeared immediately on the ground.
Chilean glaciologist Luis Muñoz and his colleague Natalia Mestre climbed the 500-meter peak of the Collins glacier last week. They expected deep snow and solid ice. Instead rain fell. Warm precipitation melted surface ice on contact. “Temperatures here went very high so everything outside melted,” Muñoz told The Guardian. “Usually there is 20cm of snow and a lot of ice on the ground at this time.”
He continued with a blunt assessment. “There was a direct impact on the glacier, which should be receiving snow now. It should not be suffering ablation at this time of the year. This is obviously not good for the glacier.” The observation carries weight. Glaciers in this region normally accumulate mass during the cold months. Melting instead of buildup accelerates long-term decline.
Raúl Cordero, climate professor at the University of Groningen, did not mince words. “This is absolutely crazy. It is also about 20C above normal for this time of the year. That is a huge anomaly.” He linked the event to extremely strong westerlies. These wind patterns have grown more frequent since the 1980s. The increase ties directly to climate change, he explained to the same outlet.
The heat arrived against a backdrop of broader warming. May 2026 ranked as the world’s second-hottest on record, according to European Union scientists. Reuters carried the data. Deep ocean temperatures around Antarctica have risen for the past two decades. Warm water masses creep closer to ice shelves. A study published in April in Communications Earth & Environment documented the shift. Time summarized the findings from University of Cambridge researchers. Hidden heat threatens stability from below while surface extremes attack from above.
Researchers tried to plant long-term sensors beneath the Thwaites Glacier, often labeled the doomsday glacier for its potential to unleash massive sea-level rise. The equipment effort largely failed. Yet the snapshots they gathered showed ocean temperatures warmer than models predicted. The International Thwaites Glacier Collaboration notes that the glacier’s retreat has accelerated over 40 years. Full collapse remains unlikely in the next few decades. Still, continued retreat through this century and the next cannot be ruled out. General collapse of the West Antarctic Ice Sheet stays possible without swift emissions cuts.
A fresh study from the Antarctic Research Center at Te Herenga Waka–Victoria University of Wellington projects surface melt could increase tenfold by 2100 absent drastic carbon reductions. Nicholas Golledge, co-author and climate professor there, spelled out the thresholds. “Under a scenario in which global temperatures rise by approximately 3.5 to 4C above pre-industrial levels, increased surface melting around the continent will leave ice shelves much more vulnerable to rapid collapse and sea-level rise.” He added that risks grow even sharper beyond 4C. The work appeared in Nature Communications and was highlighted by Phys.org.
Sea ice loss compounds the problem. Antarctica’s west coast currently misses an area of sea ice the size of France. The deficit sits over the Bellingshausen Sea. Reduced ice fails to cool warmer air flowing from the north. That absence likely intensified the recent peninsula heatwave, suggested researchers in a follow-up Guardian report published two days ago. The connection between low sea ice and atmospheric warmth has grown clearer in recent analyses.
Earlier extremes offer context. A 2024 East Antarctic winter heatwave proved the most intense in the 46-year satellite record. Nature npj Climate and Atmospheric Science detailed how such events weaken ice-shelf buttressing and speed mass loss from outlet glaciers. Similar dynamics played out in 2022 when atmospheric rivers drove both heat and heavy snowfall farther inland. Those compound events challenge simple predictions. One delivered net mass gain in parts of the interior even as coastal melt accelerated.
Yet the pattern tilts toward loss. The Hektoria Glacier retreated 15 miles in just 15 months, setting a modern record for grounded ice. NASA Earth Observatory data released in May traced the collapse to warming waters and instability that flipped the glacier from stable to unraveling almost overnight. ScienceDaily covered the speed. Such rapid shifts raise questions about tipping points. Models once viewed large sectors of Antarctica as slow responders. Evidence now shows faster “Greenlandification,” with longer melt seasons, quicker calving, and shrinking sea ice mirroring changes in the Arctic.
Projections carry uncertainty. A February 2025 review in Science outlined drivers of deep uncertainty in ice-loss forecasts. Antarctica could add 28 centimeters to global sea levels by 2100 under some pathways. Surpassing certain warming thresholds might trigger instabilities that push contributions higher. Regional conditions set the thresholds for accelerated basal melt on major ice shelves such as Filchner-Ronne and Ross. Under high-emission scenarios, total basal melt rates could rise nearly sevenfold by 2200.
Fieldwork itself grows harder. Extreme environmental events now disrupt Antarctic operations with greater frequency. Heatwaves, storms, reduced sea ice, and sudden rain alter logistics, safety protocols, and data collection. Scientists must adapt plans on the fly while the very systems they study transform around them.
The June heatwave will not single-handedly doom Antarctic glaciers. One event rarely does. But it arrives amid accumulating signals. Warmer oceans. Declining sea ice. More frequent atmospheric rivers. Stronger westerlies. Surface melt in winter. Each observation adds to the ledger. Researchers continue to refine timelines and sensitivities. They stress the value of immediate and sustained emissions reductions to delay ice loss and limit the reach of marine-based instabilities into East Antarctica.
Observations from the Collins glacier this month delivered a visceral reminder. Rain fell where snow should dominate. Ice melted where it should thicken. The images and measurements do not lie. Neither do the temperature logs. The continent is changing. How far and how fast depends on choices made far from its shores.
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