July in Callander is the warmest month of the year. In July, the weather in Callander is typically warm. Average daily high temperature in July is about 17 degrees above zero. On average, Callander has 18 rainy, 9 partly cloudy, 3 cloudy, and 1 sunny day in July. The rains are usually heavy. July as well as January, February, March, and April is considered the most uncomfortable time to visit Callander.