Umag, Croatia offers 7 beaches perfect for sunbathing, surfing, swimming, and more. Umag is known for its beautiful coastline, historic old town, and as a gateway to the Istrian wine and olive oil regions. The best time to travel to Umag, Croatia, is from June to September, when the average air temperature is around 25°C (77°F) and the sea temperature is approximately 24°C (75°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!