Taking into account the local weather in Arraial do Cabo is an important factor for planning your visit, especially if you plan to spend your trip poolside. 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.