Planning for the weather is a good way to make your trip to Caxias do Sul relaxing and enjoyable, especially when you’re splurging. The hottest months are usually January and February, with an average temperature of 21°C, while the coldest months are July and June, with an average of 13°C. The rainiest months in Caxias do Sul are October, September, January and May, with each month seeing an average of 204 mm of rainfall.