July in Altoona is the warmest month of the year. In July, the weather in Altoona is typically warm. Average daily high temperature in July is about 26 degrees above zero. On average, Altoona has 15 sunny, 10 partly cloudy, and 6 rainy days in July. The rains are usually light. July as well as August is considered the most comfortable time to visit Altoona.