Abstract:The main characteristics of the general atmospheric circulation in August 2017 are as follows. There was one polar vortex center in the Northern Hemisphere, stronger than usual. The circulation in Eurasian middle high latitudes showed a multi wave pattern. The subtropical high lay westward and its intensity in northwestern Pacific was weaker than its average state during the corresponding period of normal years. The monthly mean precipitation amount was 126.6 mm, which is more than normal by 20%, while the monthly mean temperature is 21.4℃, being higher than normal value by 0.6℃. Eight regional torrential rainfall events with extreme daily precipitation records happened in August. Five tropical cyclones were active over the northwestern Pacific and the South China Sea, and Typhoons Hato (1713) and Pakhar (1714) made landfall along the coastal areas over Pearl River Delta of China. Large scale high temperature weather occurred all over the southern part of China.