In September, the weather in Manacapuru is typically hot. Average daily high temperature in September is about 33 degrees above zero. On average, Manacapuru has 24 rainy, 3 sunny, 2 cloudy, and 1 partly cloudy day in September. The rains are usually heavy. September as well as January, February, March, and April is considered the most uncomfortable time to visit Manacapuru.