Weather is probably a major factor when you plan your trip to Calhau, 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 27°C, while the coldest months are July and June, with an average of 27°C. The rainiest months in Calhau are April, March, February and May, with each month seeing an average of 522 mm of rainfall.