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What pushed August into the global temperature record books?

The EU’s Copernicus Climate Change Service measured an average global temperature of 16.96°C in August, making it the first month since 2025 to exceed 1.5°C above pre-industrial levels.[1] Copernicus said August 2026 tied July 2023 as the hottest month on record, while August sea-surface temperatures also reached a record high.[2] Researchers estimate that emissions from warming ecosystems could amplify global heating by 20% to 30% this century, adding roughly 0.2°C to 0.4°C by 2100.[5] The study examines feedbacks involving thawing permafrost, methane-emitting wetlands and lakes, and more frequent or intense wildfires, all of which can release additional carbon dioxide or methane as temperatures rise.[3][5] By September 9, 113,226 people had been treated for fire-related respiratory conditions in Indonesia, more than double the caseload at the start of the month, while over 12.5 million people had been exposed to haze.[4] Many fires are concentrated in peatlands, where drought lets flames spread through underground deposits and combustion can produce high levels of particulates and other harmful chemicals.[4]

The field note

3 sources · 4 items
  1. August’s global average reached 16.96°C.[1]
  2. The month reached 1.65°C above pre-industrial temperatures in the Copernicus comparison.[2]
  3. August 2026 tied July 2023 for the highest global monthly temperature in the Copernicus record.[2]
Story 012 sources

What pushed August into the global temperature record books?

The EU’s Copernicus Climate Change Service measured an average global temperature of 16.96°C in August, making it the first month since 2025 to exceed 1.5°C above pre-industrial levels.[1] Copernicus said August 2026 tied July 2023 as the hottest month on record, while August sea-surface temperatures also reached a record high.[2]

Why it matters

Human-caused climate change remains the main driver of the elevated temperatures, and the record occurred alongside climate-related disasters around the world.[1] The heat was measured before the developing El Niño had reached full strength, leaving the interaction between persistent human-driven warming and the Pacific climate cycle important to monitor.[2]

Key insights

  • August’s global average reached 16.96°C.[1]
  • The month reached 1.65°C above pre-industrial temperatures in the Copernicus comparison.[2]
  • August 2026 tied July 2023 for the highest global monthly temperature in the Copernicus record.[2]
  • Global sea-surface temperatures set an August record.[1][2]
Story 022 sources

How can warming ecosystems amplify the warming humans started?

Researchers estimate that emissions from warming ecosystems could amplify global heating by 20% to 30% this century, adding roughly 0.2°C to 0.4°C by 2100.[5] The study examines feedbacks involving thawing permafrost, methane-emitting wetlands and lakes, and more frequent or intense wildfires, all of which can release additional carbon dioxide or methane as temperatures rise.[3][5]

Why it matters

No single climate model currently includes all the ecosystem feedbacks assessed by the researchers, so their combined effect could make future warming more severe than some projections indicate.[5] The findings also strengthen the case for adaptation measures such as flood barriers, drought-resistant crops and early-warning systems for climate tipping points.[5]

Key insights

  • Thawing permafrost allows microbes to decompose long-frozen organic matter, releasing carbon dioxide and methane.[5]
  • Warmer wetlands, ponds and lakes can emit more methane because microbial decomposition accelerates and warmer water retains less gas.[5]
  • Hotter air, shorter winters and drier soils can intensify wildfires, producing further carbon dioxide and methane emissions.[5]
  • Even a scenario in which human emissions decline after 2050 could see natural feedbacks add an average of 0.4°C by 2100.[5]

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