Taking into account the local weather in San Martín de Amacayacu is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually September and October with an average temp of 79°F, while the coldest months are July and June with an average of 78°F. The rainiest months in San Martín de Amacayacu are March, January, February, and December, with each month seeing an average of 15 inches of rainfall.