Weather will likely play an important role when you plan your trip to Ambala, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually June and May with an average temp of 90°F, while the coldest months are January and December with an average of 62°F. The rainiest months in Ambala are July, August, September, and June, with each month seeing an average of 8 inches of rainfall.