What is the "High Season" in Buenos Aires ? It’s the period of time between December 15th and March 15th when several things happen all at once. 1.) It’s INSANELY HOT. It should be noted that sometimes this is called the ‘hot’ season. 2.) The traveling teachers return home to practice, and to build new routines. 3.) There’s a lot of tango touristas (you). 4.) There’s a lot of seminarios that happen. 5.) Did we mention there’s a lot of people ?