Taking into account the local weather in Guia Lopes da Laguna can help you maximize your time at the pool during your trip. The hottest months are usually October and September with an average temp of 78°F, while the coldest months are July and June with an average of 69°F. The rainiest months in Guia Lopes da Laguna are February, January, December, and March, with each month seeing an average of 10 inches of rainfall.