Other facts from our historical weather data: Which is the warmest month in Lake Louise? July has an average maximum temperature of 16°C (61°F) and is the warmest month of the year. Which is the coldest month in Lake Louise? The coldest month is December with an average maximum temperature of -11°C (12°F). Which is the wettest month in Lake Louise? June tops the wettest month list with 111mm (4.4 in) of rainfall. Which is the driest month in Lake Louise? February is the driest month with 43mm (1.7 in) of precipitation. Which is the sunniest month in Lake Louise? July is the sunniest month with an average of 255 hours of sunshine. No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.