July in Celaya is the rainiest and the cloudiest month of the year. In July, the weather in Celaya is typically warm. Average daily high temperature in July is about 23 degrees above zero. On average, Celaya has 26 rainy, 3 sunny, and 2 partly cloudy days in July. The rains are usually heavy. July as well as August and September is considered the most uncomfortable time to visit Celaya.