Weather is probably a major factor when you plan your trip to Nova Gorica, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and August with an average temp of 70°F, while the coldest months are January and February with an average of 40°F. The rainiest months in Nova Gorica are November, October, September, and May, with each month seeing an average of 8 inches of rainfall.