Weather is probably a major factor when you plan your trip to Sunset Beach, 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 78°F, while the coldest months are January and February with an average of 52°F. The rainiest months in Sunset Beach are August, September, July, and December, with each month seeing an average of 7 inches of rainfall.