In the Northern Hemisphere, the main atmospheric circulation in the autumn (from September to November) of 2024 is characterized by a dipole type of polar vortex and 5-wave circulation in the middle and high latitudes. In Eurasia, the circulation pattern of the westerly wind belt is flat without significant ridges and troughs. The troughs and ridges system are weaker than the historical average, and the cold air activities affecting China are not strong. There are 14 gale events above Beaufort wind force scale 8 over offshore areas of China, including 4 produced merely by tropical cyclones, 7 jointly by cold air and tropical cyclones, two jointly by cold air and extratropical cyclones and one merely by cold air. The influence of cold air is weak. A total of 15 typhoons are generated in western North Pacific and the South China Sea, 3.6 more than the multi-year (from 1949 to 2022) average. In addition, 22 tropical cyclones are named in the world’s other oceans, and in comparison with the historical average, there are 5.3 more in the North Atlantic, 2.0 fewer in the Northeast Pacific, 0.4 more in the North Indian Ocean and 0.5 fewer in the Southern Hemisphere. There are 18 rough sea wave events with wave height higher than 2.0 m over offshore areas of China, and the number of rough sea wave days accounts for about 84% of the total number of days in this autumn. The sea surface temperature (SST) over offshore areas of China is higher than the historical average, the maximum SST anomaly occurs in the Yellow Sea and the north of the East China Sea in September, 4.0 ℃ higher than the historical average, and the minimum SST anomaly occurs in the north of Bohai Sea in October, 0.5-2.0 ℃ lower than the historical average.