In September, the weather in Nikolaevsk-na-Amure is typically warm. Average daily high temperature in September is about 13 degrees above zero. On average, Nikolaevsk-na-Amure has 15 rainy, 8 sunny, 4 cloudy, and 3 partly cloudy days in September. The rains are usually heavy. September as well as January, February, April, and May is considered the most uncomfortable time to visit Nikolaevsk-na-Amure.