Weather will likely play an important role when you plan your trip to Belem, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually October and September, with an average temperature of 28°C, while the coldest months are July and June, with an average of 27°C. The rainiest months in Belem are April, March, May and February, with each month seeing an average of 446 mm of rainfall.