Abstract:The main characteristics of the general atmospheric circulation in September 2015 are as follows. There was one polar vortex center in the Northern Hemisphere. In the middle high latitudes, the circulation presented a three wave pattern. The subtropical high lay westwards and got broken in the middle. Meanwhile, monthly mean precipitation amount was 72.4 mm, which is 14.0% more than its climatological mean (65.3 mm). Monthly mean temperature was 16.9℃, a little bit higher than its climatological mean (16.6℃). There were 6 heavy rainfall events with extreme continuous precipitation events observed at 24 stations in China. Four typhoons were generated over the western North Pacific and the South China Sea, and one typhoon came from the Middle Pacific (No. 1517 Kilo), Typhoon Dujuan (No. 1521) landing China twice. The drought of eastern part of Northwest Region and the middle of Inner Mongolia got relieved, while in most of Huanghuai Region, Liaoning and other places, the drought developed continuously. In addition, many places were attacked by thunderstorms, hail and other severe convective weather in September 2015.