Global oceans outside polar regions were record warm in July 2026
The Copernicus Climate Change Service (C3S) reported that global sea surface temperatures outside the polar regions (60°S to 60°N) reached a record 20.96°C in July 2026, surpassing the previous July record of 20.89°C set in 2023
The record warmth is attributed to rapidly intensifying El Nino conditions in the equatorial Pacific combined with long-term greenhouse gas-driven warming
Western Europe recorded its warmest June-July period on record, with average surface air temperatures 2.79°C above normal, experiencing its third and fourth heat waves of the year and soil moisture at its lowest since 2022
Widespread strong-to-severe marine heatwaves were recorded along the Atlantic and western Mediterranean coasts
Globally, July 2026 was the joint second-warmest July on record (tied with July 2024, behind July 2023)
El Nino-Southern Oscillation (ENSO)
El Nino is the warm phase of the El Nino-Southern Oscillation (ENSO), a naturally occurring climate pattern involving periodic warming of sea surface temperatures in the central and eastern equatorial Pacific Ocean. It alternates with the cool phase (La Nina) and a neutral phase, typically on a cycle of 2-7 years, and is monitored using indices such as the Oceanic Nino Index (ONI).
Key Details
- El Nino weakens the easterly trade winds, allowing warm surface water to pool in the eastern Pacific instead of being pushed toward Asia
- Global impacts include weakened Indian summer monsoon (historically correlated with below-normal rainfall years, though not always deterministic), droughts in Australia/Southeast Asia, and above-normal rainfall in parts of South America
- The 1997-98 event is considered a historic "super El Nino"; some 2026 analyses indicate sea surface temperature anomalies in 2026 have exceeded that event's peak levels [Unverified — comparative magnitude claims vary by index and dataset]
- El Nino years often correlate with global mean temperature spikes layered on top of the long-term greenhouse warming trend, since the ocean releases stored heat to the atmosphere
The record July 2026 ocean warmth reflects the combined effect of a strengthening El Nino releasing heat into the ocean-atmosphere system on top of the underlying warming trend from greenhouse gas accumulation — a compounding effect that climate scientists watch closely for its cascading effects on monsoons, marine ecosystems, and extreme weather.
Marine Heatwaves
A marine heatwave is a prolonged period of anomalously high sea surface temperature relative to the historical average for that location and time of year, generally classified by intensity into categories from "moderate" to "extreme" (a framework popularised by marine heatwave researchers such as Hobday et al.).
Key Details
- Marine heatwaves cause coral bleaching, disrupt fish migration and breeding, and can trigger harmful algal blooms
- The Copernicus Marine Service and C3S jointly track daily global sea surface temperature anomalies used to detect and classify marine heatwave events
- Persistent marine heatwaves in the Mediterranean have previously been linked to mass mortality events in benthic species (e.g., gorgonians, sponges)
- India's own coastal waters, including parts of the Arabian Sea and Bay of Bengal, have shown warming trends linked to more intense and rapidly intensifying cyclones
The "widespread strong or severe marine heatwave" conditions reported along Europe's Atlantic and Mediterranean coasts in July 2026 exemplify how record ocean warmth translates into concrete ecological and economic stress on coastal and marine systems.
Copernicus Climate Change Service (C3S) and Global Temperature Monitoring
C3S is implemented by the European Centre for Medium-Range Weather Forecasts (ECMWF) on behalf of the European Union, and is one of the principal global datasets (alongside NOAA, NASA GISS, and the UK Met Office/Hadley Centre) used to track global surface and ocean temperature anomalies against pre-industrial and recent baselines.
Key Details
- C3S measures anomalies against a 1991-2020 reference period as well as an estimated 1850-1900 pre-industrial baseline
- July 2026's global average surface air temperature was reported as roughly 0.67°C above the 1991-2020 baseline, and separately reported as around 1.47°C above the 1850-1900 pre-industrial baseline [Unverified — figures reflect different baseline periods and should be read as complementary, not contradictory]
- The Paris Agreement's long-term temperature goal references limiting warming to "well below 2°C" and pursuing efforts to limit it to 1.5°C above pre-industrial levels
- Continuous months near or above the 1.5°C threshold have intensified scientific and policy debate on whether the Paris Agreement's long-term goal is being breached on a sustained basis
The July 2026 data feeds directly into the global stocktake of progress (or lack thereof) against the Paris Agreement's temperature goals, reinforcing the record-warmth pattern seen through much of the 2020s.
- Global extrapolar (60°S-60°N) average sea surface temperature, July 2026: 20.96°C (new July record)
- Previous July SST record: 20.89°C (July 2023)
- Western Europe June-July 2026 average surface air temperature: 21.62°C, 2.79°C above normal
- July 2026 global average surface air temperature: joint second-warmest July on record (tied with July 2024), ~0.67°C above the 1991-2020 baseline
- Reporting agency: Copernicus Climate Change Service (C3S), implemented by ECMWF for the EU
- UNCCD/UNFCCC context: Paris Agreement (2015) long-term goal — well below 2°C, pursue 1.5°C above pre-industrial levels