The general atmospheric circulation in the northern hemisphere in autumn (from September to November) 2018 was characterized by the dipole polar vortex and five-wave mode westerlies in middle and high latitudes, which was stronger than that in summer. From September to October, the subtropical high was located abnormally westward with higher intensity, tropical cyclones were still active, and the westerly belt was straighter without significant ridge and trough. In November, cold air activities were intensified due to the enhanced meridional circulation. In autumn 2018, there were 13 gale processes above 8 grade over offshore areas of China, including 6 produced by cold air and tropical cyclones, 5 by cold air, two by tropical cyclones. There were 10 rough sea wave processes above two meters. In western North Pacific and the South China Sea, there were 8 typhoons and one tropical depression. In addition, there were 28 tropical cyclones over other oceans in the world, which was more than that in normal years. The sea surface temperature showed a downtrend tendency on the whole. In this season, there was no thunderstorm gale or large-scale sea fog process.