If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Salta: The hottest months are usually January and December, with an average temperature of 19°C, while the coldest months are July and June, with an average of 12°C. The rainiest months in Salta are February, March, December and January, with each month seeing an average of 286 mm of rainfall.