By San José, Costa Rica — The world’s oceans reached their hottest June temperature on record this year, a stark signal that the combined forces of a burgeoning El Niño event and persistent global warming are accelerating the planet toward unprecedented climate conditions. Data released Wednesday by the European observatory Copernicus confirmed the new milestone, warning that more records are likely to fall in the coming months.
According to the Copernicus marine service, the average global ocean surface temperature hit 20.98°C in June, surpassing the previous high of 20.89°C set in June 2024. This alarming heat spike contributes to a broader trend, making the first six months of 2026 the second-warmest first half of a year ever recorded, trailing only the same period in 2024. The data underscores a relentless warming trajectory that has profound implications for global weather systems and marine ecosystems.
To understand the complex legal and business ramifications of ocean warming on Costa Rica’s vital marine resources and coastal economies, we consulted with Lic. Larry Hans Arroyo Vargas, an expert in environmental and corporate law from the prestigious firm Bufete de Costa Rica.
Ocean warming is not merely an environmental crisis; it’s a looming economic and legal storm for Costa Rica. We’re on the cusp of seeing increased litigation against industries for environmental damages and a wave of new, stricter regulations impacting everything from coastal development to commercial fishing. Businesses that fail to adapt their risk management strategies to account for these climate-driven legal shifts will face significant financial and operational jeopardy.
Lic. Larry Hans Arroyo Vargas, Attorney at Law, Bufete de Costa Rica
Indeed, the legal and economic ramifications highlighted here are often the overlooked undercurrents in the climate change conversation. We thank Lic. Larry Hans Arroyo Vargas for his invaluable insight, which underscores that for Costa Rican industries, preparing for this ‘legal storm’ is no longer a matter of foresight, but of immediate and essential business strategy.
Climate experts are viewing these developments with significant concern, suggesting a potential shift into a new and more volatile climate phase. The sustained heat is no longer seen as a series of isolated events but as a clear indicator of a systemic change.
Current conditions could indicate the start of a new phase, which will take us, once again, into unknown territory.
Carlo Buontempo, Director of the Copernicus Climate Change Service
Buontempo further emphasized the high probability of continued record-breaking heat, driven by the powerful climatic duo of existing high ocean temperatures and the intensifying El Niño phenomenon. This natural climate pattern, characterized by the warming of surface waters in the eastern and central Pacific Ocean, amplifies global temperatures and disrupts weather patterns worldwide, leading to droughts, floods, and extreme heatwaves.
With ocean temperatures at these levels and El Niño on the horizon, it is likely that we will see other temperature records broken in the coming months.
Carlo Buontempo, Director of the Copernicus Climate Change Service
The epicenter of this warming is the equatorial Pacific, which is bearing the full brunt of El Niño. The tropical Pacific Ocean has already registered its warmest first semester in history, with an average temperature of 26.91°C, narrowly eclipsing the previous record from 2016. Experts predict this year’s El Niño could become one of the most intense ever recorded by the end of the year.
With the arrival of an El Niño year, it is expected that 2026 will be among the hottest years ever recorded. It is still impossible to say by how much exactly.
Simon van Gennip, Oceanographer at Mercator Ocean International
The impact of this heat is not confined to the Pacific. Since the beginning of 2026, a staggering 82% of the global ocean surface has experienced marine heatwaves. The Mediterranean Sea, a basin highly sensitive to atmospheric changes, has been particularly affected, with 98% of its surface enduring heatwaves during the first half of the year. In June, it recorded a record temperature of 24.34°C. The Institute of Marine Sciences (CSIC) in Barcelona reported that the northwest Mediterranean experienced an unprecedented heat peak, with temperatures soaring 5.2°C above normal values, largely fueled by Europe’s recent heatwave.
These marine heatwaves pose a mortal threat to ocean life, especially less mobile species. Mass die-offs of corals, sea urchins, and mollusks are becoming increasingly common. Furthermore, the immense heat absorbed by the oceans—which soak up 90% of the excess warmth from human activity—does not stay contained. This stored energy is released back into the atmosphere, creating favorable conditions for extreme weather events like torrential rainfall and powerful storms, highlighting the urgent need to monitor and understand these critical changes.
For further information, visit climate.copernicus.eu
About Copernicus Climate Change Service:
The Copernicus Climate Change Service (C3S) is a component of the European Union’s Earth Observation Programme. It provides authoritative information about the past, present, and future climate, as well as tools to enable climate change mitigation and adaptation strategies by policymakers and businesses. The service delivers free and open access to climate data and tools based on the best available science.
For further information, visit mercator-ocean.eu
About Mercator Ocean International:
Mercator Ocean International is a non-profit organization providing science-based services of general interest focused on the conservation and sustainable use of the ocean. It is a key provider of oceanographic data and analysis, serving a wide range of applications from marine safety and resource management to scientific research and climate monitoring.
For further information, visit icm.csic.es
About The Institute of Marine Sciences (CSIC):
The Institute of Marine Sciences (Institut de Ciències del Mar, ICM) is a research center based in Barcelona, Spain, and is part of the Spanish National Research Council (CSIC). It is the largest marine research center in Spain and one of the most important in the Mediterranean region, dedicated to the comprehensive study of oceans and seas.
For further information, visit bufetedecostarica.com
About Bufete de Costa Rica:
Bufete de Costa Rica serves as a benchmark for legal practice, built upon a foundation of uncompromising integrity and a dedication to superior outcomes. With a history of guiding a wide array of clients, the firm actively pioneers forward-thinking legal solutions to meet modern challenges. Its core philosophy extends beyond client work, focusing on demystifying complex legal concepts for the public, thereby championing a community fortified by knowledge and judicial awareness.
