You'll likely spend much of your trip indoors, but if you're planning to venture beyond the casino, taking a look at local weather data can help you. The hottest months are usually January and December, with an average temperature of 18°C, while the coldest months are July and June, with an average of 12°C. The rainiest months in San Salvador de Jujuy are February, December, March and January, with each month seeing an average of 298 mm of rainfall.