Taking into account the local weather in San Augusto is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually April and May with an average temp of 70°F, while the coldest months are July and August with an average of 69°F. The rainiest months in San Augusto are March, April, January, and February, with each month seeing an average of 26 inches of rainfall.