Weather will likely play an important role when you plan your trip to Kannan Devan Hills, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually April and March with an average temp of 81°F, while the coldest months are January and December with an average of 74°F. The rainiest months in Kannan Devan Hills are October, November, August, and December, with each month seeing an average of 7 inches of rainfall.