Beilun District belongs to subtropical monsoon climatic region. As it is on East China Sea, it is wet and mild, with clear-cut seasons, long frost-free period, and adequate rains.

Spring lasts 82 days, summer 88 days, autumn 64 days, and winter 132 days. The annual average temperature is 16.5 degree centigrade; the annual average rainfall amount is 1,316.8mm, and 150 rain days. On average, it is influenced by 2-3 typhoons, 6 at most. Influential typhoons often happen in June to October, mostly in August, and September and July the second. Seriously influential typhoons often happen in late August and early September, about 70%. There are 30.5 storm days in average, 44 days at the most. Baiu rainy period mostly happens in mid June to early July, with the average rainfall of 244mm and 26 rainy days.

In winter, northwest wind prevails, and it is dry and cold, with the lowest temperature of -6.6 degree centigrade.

In spring, the temperature returns, rainfall increases, and east wind prevails.

In summer, southeast wind prevails, rainfall mainly happens in Maiu rainy period and flood season. In July and August, it enters dry season, with the highest temperature extremum of 40.5 Celsius degrees (July 5, 2005).

In September, autumn comes, and the temperature falls. The gap between day and night is large, and southwest wind.