Taking into account the local weather in Dunnellon is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually August and July with an average temp of 81°F, while the coldest months are January and February with an average of 62°F. The rainiest months in Dunnellon are August, July, June, and September, with each month seeing an average of 7 inches of rainfall.