Taking into account the local weather in Guarajuba is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually January and February with an average temp of 80°F, while the coldest months are July and August with an average of 75°F. The rainiest months in Guarajuba are May, April, July, and June, with each month seeing an average of 19 inches of rainfall.