Planning for the weather is a good way to make your trip to Calca relaxing and enjoyable, especially when you’re splurging. The hottest months are usually October and November with an average temp of 51°F, while the coldest months are July and June with an average of 48°F. The rainiest months in Calca are February, December, January, and March, with each month seeing an average of 14 inches of rainfall.