The latest info from NOAA's National Climatic Data Center is, showing that September 2012 tied with 2005 for the warmest September on record, based on combined global land and ocean surface temperatures. The month was 0.67°C above the 20th century average.
Just looking at land temperatures, September 2012 was the third warmest on record, slightly below the record set in 2009. Ocean surface temperatures in September 2012 were the second warmest on record, slightly below the 2003 levels.
For the January to September 2012 period the year so far is the 8th warmest, based on combined land and ocean temperatures, 0.57°C above the 20th century average. Global land temperatures for the period were 0.95°C above average, with ocean surface temperatures 0.43°C above average.
Read more: September 2012 State of the Climate