The US weather agency says that new temperature highs are unparalleled in 136 years of record-keeping, across the globe the heat is unrelenting.
According to the National Oceanic and Atmospheric Administration (NOAA), the hottest August was on record last month. This temperature is higher than the 20th century average of 15,6 degrees Celsius.
The agency said the June-to-August average was also the highest dating back to 1880, when records were first kept. This was also the highest ever for the first eight months of any year.
NOAA said that the higher temperatures have trimmed the extent of the Arctic ice pack to its fourth smallest size for August since these figures were first collected in 1979.
High temperatures are the result of a combination of human-caused climate change related to greenhouse gas emissions, scientists say.