Weather will likely play an important role when you plan your trip to San Martín de los Andes, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually January and February, with an average temperature of 13°C, while the coldest months are July and August, with an average of 1°C. Average annual precipitation for San Martín de los Andes is 1003 mm.