Planning for the weather is a good way to make your trip to Tucuman relaxing and enjoyable, especially when you're splurging. The hottest months are usually January and December, with an average temperature of 25°C, while the coldest months are July and June, with an average of 15°C. The rainiest months in Tucuman are January, February, December and March, with each month seeing an average of 199 mm of rainfall.