Weather will likely play an important role when you plan your trip to Katni, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually May and April with an average temp of 89°F, while the coldest months are January and December with an average of 68°F. The rainiest months in Katni are July, August, September, and June, with each month seeing an average of 12 inches of rainfall.