Abstract:The main characteristics of the general atmospheric circulation in September 2021 are as follows. The polar vortex showed a single pole pattern. The circulation presented a three wave pattern in middle high latitudes. The northwestern Pacific subtropical high extended remarkably more westward than normal. The monthly mean precipitation amount was 83.8 mm, which is 28.5% more than normal (65.2 mm). The monthly mean temperature was 18.2℃, 1.6℃ higher than normal. Four large range heavy precipitation processes occurred over China, of which Southwest China, North China and Northeast China were caught by severe precipitation, and some local areas suffered from serious disasters. Four typhoons were generated over northwestern Pacific Ocean and the South China Sea, but none landed on China. The east of Southwest China, the east of Northwest China to North China, the Huanghuai Region and other places suffered from torrential rain and flood disasters. Autumn rain in West China came earlier than normal and were stronger. The meteorological droughtin Northwest China eased but continued in South China.〖JP〗 Periodic high temperatures occurred in the south of China with some areas experiencing drought.