If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Rodanthe: 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 54°F. The rainiest months in Rodanthe are August, September, July, and November, with each month seeing an average of 8 inches of rainfall.