Using the daily maximum, minimum and mean temperature data from 733 stations of 10 provinces (cities) in Southern China from 1960 to 2013, the extremely high temperature of 2013 in Southern China was deeply analyzed. The results showed that the high temperature in summer of 2013 in Southern China has significant characteristics of clustering, covering the middle and lower reaches of the Yangtze River and Chongqing areas. The high temperature has the feature of persistence, which is constituted of four high temperature processes mainly. The third time of high temperature from 22 July to 21 August is the strongest and broadest. Further analysis on the regional extreme temperatures showed that the average temperature, the average maximum temperature, and the average minimum temperature all have broken the records in the late 50 years. The time and intensity of average high temperature exceeds the extreme value in history. The extreme value scope of high temperature time and high temperature strength expand to the north, and the values of high temperature center exceed the historical records. The frequency of extremely high temperature events in 2013 has broken the historical records, and is extremely outstanding in August.