Abstract:The main characteristics of the general atmospheric circulation in August 2021 are as follows. The polar vortex of Northern Hemisphere presented a single pattern. In the mid high latitudes of Asia, the circulation presented a two trough and one ridge pattern. The subtropical high lay westward obviously. Meanwhile, the monthly mean precipitation was 118.3 mm, which is more than its normal value (105.2 mm) by 12.0%. The monthly mean temperature was 21.1℃, 0.3℃ higher than its climatological mean (20.8℃). Ten regional torrential rainfall events happened in August, and one of them was caused by tropical cyclone. In August, four tropical cyclones were active over the northwestern Pacific Ocean and the South China Sea, and Typhoon Lupit (2109) made landfall in Fujian Province and Guangdong Province of China. During this month, southern China suffered from heavy rains and floods, and drought continued over eastern areas of Northwest China. In addition, persistent high temperature occurred in northwest of South China, southwest of Jiangnan and southeast of Sichuan Province. Many provinces experienced severe convections, and some areas suffered from serious disasters.