Planning for the weather is a good way to make your trip to Santa Cruz do Sul relaxing and enjoyable, especially when you're splurging. The hottest months are usually January and February, with an average temperature of 24°C, while the coldest months are July and June, with an average of 14°C. The rainiest months in Santa Cruz do Sul are October, September, July and January, with each month seeing an average of 194 mm of rainfall.