Jarvenpaa, Finland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Baja California Sur, Mexico, is known for Cabo San Lucas and the Sea of Cortez. The best time to travel to Jarvenpaa, Finland, is during the summer months of June to August, when the average air temperature is around 15-20°C (59-68°F) and the water temperature in nearby lakes is approximately 18-22°C (64-72°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!