In the summer (June to August) of 2023, the atmospheric circulation features are as follows: in the Northern Hemisphere, the polar vortex exhibits a bipolar distribution with weakened intensity compared to the annual average. The synoptic mid-latitude circulation on 500 hPa in the Eurasian region and the northwestern Pacific are similar to the annual average. The subtropical high is located further west and slightly south of its annual average position, with greater intensity and a larger coverage area. In June, coastal areas in the eastern and northern parts of China experienced three processes of sea fog, while there is no extensive sea fog events observed in July and August. Throughout the summer, the northwestern Pacific generated ten typhoons, which is fewer than the annual average, with significantly stronger average maximum intensity. More secifically, in June, one typhoon generated offshore. In July, three typhoon formed, among which two typhoons made landfall in China. In August, typhoon activity was frequent, six typhoons formed and two out of which made landfall in China in September. Additionally, there were 20 named tropical cyclones in other basins. During the summer, China's coastal regions experienced six episodes of severe winds exceeding wind scale 8 (B.F.), with five of them attributed to tropical cyclones and one to the Jianghuai cyclone entering the sea. There were 12 occurrences of waves higher than 2 meters. In the summer, sea surface temperature in the northwestern Pacific and South China Sea is generally higher than the annual average. Typhoon activity significantly influenced the distribution pattern of wave height and sea surface temperature.