If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Nullatanni: The hottest months are usually March and April with an average temp of 75°F, while the coldest months are January and February with an average of 72°F. The rainiest months in Nullatanni are July, August, June, and October, with each month seeing an average of 22 inches of rainfall.