The average temperature was 0.81 C in September. This was up a little from August (0.76C). However 2021 is turning out to cooler than recent years with an average annual temperature with 3 months remaining of 0.69C. This makes it on track to be the coolest year since 2014.
The monthly data show the effects of the 2021 La Nina.
This strong La Nina is evident in the latest SST data.
Over land areas cold spots in Siberia, Greenland and Alaska/Kamchatka are evident.
With just 3 months to go and a continuing la Nina, it looks almost certain that 2021 will either be the coldest or the next coldest of the last 7 years.