Weather will likely play an important role when you plan your trip to Arraial do Cabo, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually February and March with an average temp of 78°F, while the coldest months are July and August with an average of 71°F. The rainiest months in Arraial do Cabo are November, December, January, and March, with each month seeing an average of 8 inches of rainfall.