Overveen, Ireland offers 9 beaches perfect for sunbathing, surfing, swimming, and more. Overveen, known for its proximity to the beautiful Zuid-Kennemerland National Park. Leinster, Ireland, known for the historic and vibrant city of Dublin. Overveen is in the Netherlands, not Ireland, and the best time to visit is from June to August when the average air temperature is around 20°C (68°F) and the North Sea water temperature is about 17°C (63°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!