If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Destin: The hottest months are usually August and July, with an average temperature of 28°C, while the coldest months are January and February, with an average of 14°C. The rainiest months in Destin are August, July, December and June, with each month seeing an average of 181 mm of rainfall.