Taking into account the local weather in Rio Cuarto is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually March and April with an average temp of 71°F, while the coldest months are January and February with an average of 70°F. The rainiest months in Rio Cuarto are October, June, September, and August, with each month seeing an average of 20 inches of rainfall.