Taking the local weather in Sao Joao do Oeste 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 24°C, while the coldest months are July and June, with an average of 16°C. The rainiest months in Sao Joao do Oeste are October, May, June and December, with each month seeing an average of 224 mm of rainfall.