Taking the local weather in Monte Sião 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 September and October, with an average temperature of 22°C, while the coldest months are July and June, with an average of 17°C. The rainiest months in Monte Sião are January, December, February and November, with each month seeing an average of 222 mm of rainfall.