"While July is usually the warmest month of the year for the globe, according to our data it also was the warmest month recorded globally, by a very small margin," Jean-Noel Thepaut, head of the Copernicus Climate Change Service, said in a statement.
Searing heat waves saw records tumble across Europe last month, with unusually high temperatures within the Arctic Circle as well.
Globally, July 2019 was marginally warmer - by 0.04 degrees Celsius (0.072 Fahrenheit) - than the previous hottest month on record, July 2016.
Scientists say it's the latest sign that Earth is experiencing unprecedented warming.