1:23
The Antarctic sea ice extent for the month was 1.3% below the average between 1981 and 2010.
The only other September that was just as hot was in 2015, according to NOAA. Septembers in 2015, 2016 and 2019 had global land and ocean surface temperature greater or equal to 1.62 degrees Fahrenheit.
![\"PHOTO:](\"http://a.abcnews.com/images/US/thermometer-ap-jt-191016_hpEmbed_3x2_384.jpg\")
Last month was also the 43rd consecutive September and 417th consecutive month overall with temperatures above the 20th-century average, according to NOAA.
In addition, the first nine months of 2019 saw the second-warmest period for January for September in the 140-year record.
ABC News' Max Golembo contributed to this report.
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