Umu, Indonesia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Dimitriada, Thessaly, Greece, is known for its ancient ruins and historical significance as a former major city of the Byzantine Empire. The best time to travel to Umu, Indonesia, is during the dry season from May to September, when the average air temperature is around 27-30°C (81-86°F) and the water temperature is approximately 28°C (82°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!