July Sea Temperatures Hit Record Highs, Scientists Warn 2026

July sea temperatures have hit record highs, with scientists confirming that the world's seas were hotter last month than in any July on record. This alarming milestone underscores the accelerating impact of climate change on our oceans and coastal communities.

Record-Breaking Ocean Heat in July

The EU's Copernicus climate change service reported that sea surface temperatures reached unprecedented levels in July, particularly along the Atlantic coast and western Mediterranean. Globally, the average sea surface temperature outside polar regions was the highest ever recorded for the month, surpassing the previous July record set in 2023.

Surface air temperatures in July 2026 were marginally cooler than July 2024 by just 0.01°C, leading scientists to consider the two months as joint-second warmest Julys on record. This persistent heat is a clear sign of climate breakdown intensifying extremes that reinforce each other.

Impacts on Marine Life and Weather

Severe marine heatwaves are roiling Europe's seas, causing devastating effects on marine ecosystems. Coral bleaching, fish migration shifts, and loss of biodiversity are among the consequences. The heat also amplifies drought conditions on land, as Samantha Burgess of the European Centre for Medium-Range Weather Forecasts explained: "As soils dry out, they lose their ability to provide natural cooling, allowing heat to build more readily."

Western Europe has experienced its hottest June-July period on record, with "exceptional" heat driving wildfires that devastated swathes of the Mediterranean. The first two summer months of 2026 were 2.79°C hotter than usual, beating the previous record set four years ago.

Comparison of July Sea Surface Temperatures (Global Average, Excluding Polar Regions)

Note: Data based on Copernicus ERA5 reanalysis (illustrative).

Central Europe Heatwave and Records

Central Europe is reeling from a heatwave in which national temperature records fell in Austria and Slovakia. This scorching summer has dried out vegetation, priming the continent to burn. The heatwaves, supercharged by fossil fuel pollution, have hit Europe since the end of spring, with particularly brutal heat at the end of June expected to have resulted in more than 10,000 excess deaths.

Key Takeaways

• July 2026 set a new record for global sea surface temperatures, beating 2023.
• Marine heatwaves are intensifying, threatening marine biodiversity and coastal economies.
• Land and ocean heat are interconnected, worsening drought and wildfire risks.
• Fossil fuel pollution is the primary driver of these extremes.
• Immediate climate action is needed to curb further warming.

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