Hoi An's climate is warm and humid year-round, with temperatures steadily increasing from January to May before peaking in June and July. The summer months bring sweltering heat, with temperatures often reaching above 38°C, while the rainy season brings brief respite in August and September. Autumn months of October to November see a slight decrease in temperature, but still remain warm. Winter months are mild, with temperatures ranging from 16°C to 28°C. The coolest period is December, but even then, temperatures rarely drop below 16°C.