Taking into account the local weather in Salto Grande is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually December and September with an average temp of 74°F, while the coldest months are July and June with an average of 65°F. The rainiest months in Salto Grande are January, February, December, and November, with each month seeing an average of 8 inches of rainfall.