Osterby, Estonia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Osterby, Laane, Estonia, is known for the Matsalu National Park, a renowned birdwatching destination. The best time to travel to Osterby, Estonia, is during the summer months of June to August, when the average air temperature is around 17-20°C (63-68°F) and the Baltic Sea water temperature is approximately 16-20°C (61-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!