Planning for the weather is a good way to make your trip to Salinas Grandes relaxing and enjoyable, especially when you're splurging. The hottest months are usually March and April, with an average temperature of 29°C, while the coldest months are December and January, with an average of 27°C. The rainiest months in Salinas Grandes are October, September, June and May, with each month seeing an average of 397 mm of rainfall.