C3S: September 2024 was second-warmest September globally

C3S: September 2024 was second-warmest September globally
11 / 10 / 2024
By Marwa Nassar - -

The Copernicus Climate Change Service (C3S) said that September 2024 was the second-warmest September globally in the ERA5 dataset, after September 2023, with an average surface air temperature of 16.17°C. Last month was 0.73°C above the 1991-2020 average for September.

According to ERA5, which provides hourly temperature data from 1940, September 2024 was 1.54°C above the pre-industrial level. This was the 14th month since July 2023 in which the global-average surface air temperature exceeded 1.5°C above pre-industrial levels.

The global mean temperature anomaly for January-September was 0.71°C above the 1991-2020 average and 0.19°C warmer than the same period in 2023. This makes it very likely that 2024 will end up as the warmest year on record

According to Samantha Burgess, Deputy Director of the Copernicus Climate Change Service (C3S), ”September 2024 was the second warmest both globally and for Europe. The extreme rainfall events of this month, something we are observing more and more often, have been made worse by a warmer atmosphere, leading to more intense rainfall with months’ worth of rain falling in just a few days. The risk of extreme rainfall will continue to increase with rising temperatures; the sooner we reach NetZero emissions, the sooner we can mitigate this risk.” 

For Europe, the average temperature for September 2024 was 1.74°C above the 1991-2020 average for September, making the month the second warmest September on record for Europe after September 2023, which was 2.51°C above average. Temperatures were most above over eastern and northeastern Europe, but below average in a large part of western Europe, including France, most of the Iberian Peninsula, and Iceland. 

The average sea surface temperature (SST) for September 2024 over 60°S–60°N was 20.83°C. This is the second highest on record for the month, and only 0.09°C below the record set in September 2023.  

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