Weather will likely play an important role when you plan your trip to Niksic, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and July with an average temp of 65°F, while the coldest months are January and February with an average of 35°F. The rainiest months in Niksic are November, December, January, and February, with each month seeing an average of 13 inches of rainfall.