Taking the local weather in São Cristóvão do Sul into account can help you maximise your time at the pool during your trip. The hottest months are usually January and February, with an average temperature of 20°C, while the coldest months are July and June, with an average of 12°C. The rainiest months in São Cristóvão do Sul are October, January, December and September, with each month seeing an average of 203 mm of rainfall.