Guilhermina, Brazil offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Guilhermina is known for its beautiful beaches and vibrant coastal atmosphere. The best time to travel to Guilhermina, Brazil, is from May to September, when the average air temperature ranges from 18°C to 25°C (64°F to 77°F) and the water temperature is around 22°C to 24°C (72°F to 75°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!