July in Columbia is the sunniest and the hottest month of the year. In July, the weather in Columbia is typically hot. Average daily high temperature in July is about 31 degrees above zero. On average, Columbia has 16 sunny, 10 rainy, 4 partly cloudy, and 1 cloudy day in July. The rains are usually heavy. July as well as January, February, March, and May is considered the most uncomfortable time to visit Columbia.