July in Niamey is the rainiest month of the year. In July, the weather in Niamey is typically hot. Average daily high temperature in July is about 35 degrees above zero. On average, Niamey has 15 partly cloudy, 8 cloudy, 7 sunny, and 1 rainy day in July. July as well as March, April, May, and June is considered the most uncomfortable time to visit Niamey.