July in Lake Louise is the rainiest, the windiest, and the warmest month of the year. In July, the weather in Lake Louise is typically warm. Average daily high temperature in July is about 15 degrees above zero. On average, Lake Louise has 17 rainy, 8 sunny, 5 partly cloudy, and 1 cloudy day in July. The rains are usually heavy. July as well as January, February, June, and August is considered the most uncomfortable time to visit Lake Louise.