Weather is probably a major factor when you plan your trip to Tarija, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually October and November with an average temp of 61°F, while the coldest months are July and June with an average of 53°F. The rainiest months in Tarija are February, December, January, and March, with each month seeing an average of 12 inches of rainfall.