Taking the local weather in Santo Antônio das Missões into account is an important factor for planning your visit, especially if you plan to spend your trip by the pool. The hottest months are usually January and February, with an average temperature of 25°C, while the coldest months are July and June, with an average of 15°C. The rainiest months in Santo Antônio das Missões are October, November, January and September, with each month seeing an average of 219 mm of rainfall.