August in Niamey is the rainiest and the cloudiest month of the year. In August, the weather in Niamey is typically hot. Average daily high temperature in August is about 32 degrees above zero. On average, Niamey has 15 rainy, 7 sunny, 6 partly cloudy, and 3 cloudy days in August. The rains are usually heavy. August as well as April and July is considered the most uncomfortable time to visit Niamey.