September 2025 3rd-Warmest September In Instrumental Record (Behind September 2023 & September 2024)

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Global temperatures last month remained high across much of the world, proof of the “continuing influence of greenhouse gas accumulation in the atmosphere,” according to a monthly bulletin by the Copernicus Climate Change Service (C3S).

The global average surface air temperature for September was 16.11C, the third-highest on record for the month. Only September 2023 and 2024 were warmer – 0.27C and 0.07C warmer, respectively. The average temperature in the past 12 months was 1.51C above the pre-industrial average.

If long-term global warming exceeds 1.5C, a limit that is considered breached when consistently surpassed over decades, experts warn that critical tipping points will be breached. This could lead to devastating and potentially irreversible consequences for several vital Earth systems that sustain a hospitable planet, such as rising sea levels, more intense heatwaves, stronger storms, and disruptions to ecosystems and biodiversity.

So far, the world has warmed by 1.3C compared to pre-industrial times – with more than two-thirds (~1C) of this warming occurring since 1975. Rising temperatures, a consequence of increasing levels of greenhouse gases in the atmosphere, primarily from fossil fuel burning, have devastating impacts on the planet. These include more frequent and severe weather events such as heatwaves and tropical cyclones, melting ice caps, rising sea levels, and disruptions to ecosystems and biodiversity.

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https://earth.org/september-sees-persistently-high-land-and-sea-surface-temperatures-globally/