If you're looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in São Luís Historical Center: The hottest months are usually October and September, with an average temperature of 27°C, while the coldest months are July and June, with an average of 27°C. The rainiest months in São Luís Historical Center are April, March, February and May, with each month seeing an average of 522 mm of rainfall.