The world's September temperatures were the warmest on record, breaking the previous high by a huge margin, according to the EU climate service, APA reports citing BBC.
Last month was 0.93C warmer than the average September temperature between 1991-2020, and 0.5C hotter than the previous record set in 2020.
Ongoing emissions of warming gases in addition to the El Niño weather event are driving the heat, experts believe.
Some scientists said they were shocked by the scale of the increase.
They say 2023 is now "on track" to be the warmest on record.
September's high mark comes in the wake of the hottest summer on record in the northern hemisphere as soaring temperatures show no signs of relenting.
The data, from the Copernicus Climate Change Service, shows that the month had the biggest jump from the long term average in records dating back to 1940.
Scientists have been quite shocked by some of the detail in the data.
"This month was, in my professional opinion as a climate scientist - absolutely gobsmackingly bananas," Zeke Hausfather, an experienced researcher, wrote on X formerly known as Twitter.
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