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August sets a global heat record, matching the warmest recorded month

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First brief 11 Sep, 2:50 am IST Updated 11 Sep, 2:50 am IST 1 development 2 min read Latest ↓

File image: Earth’s eastern hemisphere — NASA · Public domain

Where it stands

August 2026 was the warmest August in the Copernicus global temperature record. The average surface air temperature was 16.96°C, or 0.85°C above the August average for 1991–2020. It was also effectively tied with July 2023 as the warmest calendar month recorded globally. Against the estimated pre-industrial August average, the increase was 1.65°C. These figures describe a global monthly average, not the temperature experienced in every place. Nor does a single month above 1.5°C establish that the Paris Agreement’s long-term warming limit has been crossed. The record nevertheless shows the continuing pressure of exceptional heat.

Background

To judge whether a month is unusually warm, scientists compare it with the same month over a reference period. This removes the ordinary difference between seasons. They also compare modern temperatures with an estimated pre-industrial baseline to assess global warming. A month can exceed that baseline by more than 1.5°C while the longer-term average remains lower. Short-term variations, including El Niño, act on top of the warming climate. A monthly record is therefore an important warning, but not a complete measure of long-term warming or a forecast for one locality.

How it developed

31 July 2026: WMO’s earlier seasonal warning

How it started
A warming climate and El Niño frame the summer’s risks

The World Meteorological Organization warned on 31 July 2026 that El Niño was strengthening. This natural pattern involves unusually warm water in the central and eastern equatorial Pacific. It can alter atmospheric circulation and shift temperature and rainfall patterns elsewhere. Its effects vary across regions and do not determine every local weather event. Seasonal forecasts help governments prepare for risks; they do not guarantee a particular outcome. The August measurements now provide observations for a month that those earlier forecasts had identified as part of a high-risk season.

World Meteorological Organization Copernicus Climate Change Service World Meteorological Organization
August 2026: global temperatures; bulletin released 10 Sep

New fact
August joins July 2023 at the top of the global record

Copernicus recorded an August 2026 global average of 16.96°C. The difference from July 2023 was less than 0.01°C, so the two months are treated as jointly warmest. August’s warmth reflected exceptionally high temperatures over both land and oceans. The global result should not be confused with a separate regional ranking: Europe did not have its warmest summer. Nor can one hot month settle the full-year ranking for 2026. The comparison is based on the ERA5 dataset, whose temperature record extends back to 1940.

Copernicus Climate Change Service Copernicus Climate Change Service

Why it matters for UPSC

GS1 · ClimatologyGS3 · Climate change

For GS1 and GS3, connect climate variability with long-term warming. Read the baseline, geographical coverage and averaging period before comparing temperature figures. Explain why an observed monthly record and a forecast of future conditions answer different questions.

Key terms

Surface air temperatureThe temperature of air close to Earth’s surface. In ERA5 it is represented at a height of about two metres over land and sea. This differs from sea-surface temperature, which measures the water itself. A global average combines conditions across a very large area.

Temperature anomalyThe difference between an observed temperature and the average for a specified reference period. Comparing August with earlier Augusts avoids confusing seasonal warmth with an unusual change. An anomaly is a difference in degrees, not the actual temperature measured outside.

Reference periodThe years used to calculate a comparison average. Copernicus commonly uses 1991–2020 to describe recent climate. Its pre-industrial comparison uses an estimate for 1850–1900. The same month therefore has different anomalies against the two baselines; those figures do not contradict each other.

ERA5 reanalysisA consistent reconstruction of past atmospheric conditions produced by combining observations with a weather model. It allows scientists to compare different places and periods using a common method. The global temperature record used here extends to 1940; “on record” does not mean all of Earth’s history.

Pre-industrial baselineAn estimated average for 1850–1900, used to represent conditions before much of modern industrial warming. ERA5 does not itself reach that period, so Copernicus relates its values to earlier observations using a documented method. This makes the historical comparison an estimate, not a direct ERA5 reading.

The Paris temperature goalCountries agreed to keep long-term warming well below 2°C and pursue efforts to limit it to 1.5°C above pre-industrial levels. The goal concerns sustained warming over decades. A monthly exceedance is a warning signal, not by itself a declaration that the long-term limit has been crossed.

El NiñoA naturally occurring pattern of unusually warm surface water in the central and eastern equatorial Pacific. It can change atmospheric circulation and affect weather far away. Its influence varies by season and region, and operates alongside human-driven warming rather than replacing that explanation.

Global average versus local weatherA global monthly average combines conditions across the planet and across many days. Some regions can be cooler than usual even during a record global month. The global figure cannot tell a farmer or city resident exactly what temperature or rainfall to expect locally.

Sources (4)

World Meteorological Organization · official · Strong El Niño expected to intensify, 31 July 2026
Copernicus Climate Change Service · official · Climate bulletin: data, reference periods and temperature definitions
World Meteorological Organization · official · Monthly exceedances and the Paris Agreement’s long-term goal, 8 July 2024
Copernicus Climate Change Service · official · Surface air temperature for August 2026