September third-hottest globally on record: EU monitor

This September was the third-warmest September globally, with an average surface air temperature of 16.11 degrees C, 0.66 degree C above the 1991-2020 average for September, Copernicus Climate Change Service (C3S), the EU monitor, said on Thursday.

- Jayashree Nandi

A man resting under a water misting system to cool down on a hot day in Tokyo, on September 6.

(AFP)

This September was the 9th warmest for India in terms of mean temperature and 5th warmest in terms of night temperatures. Over east and northeast India it was the third warmest, as per India Meteorological Department.

This September was 1.47°C warmer than pre-industrial levels or the average for the 1850-1900 period. The 12-month average temperature from October 2024 to September 2025 was 0.63°C above the 1991-2020 average, and 1.51°C above the pre-industrial level, C3S said.

Despite approaching La Nina conditions both land and sea surface temperatures (except for central and eastern equatorial Pacific) remained very high. The global average sea surface temperature (SST) for September 2025 was 20.72'C, the third-highest value on record for the month, 0.20°C below the September 2023 record.