Estoril, Portugal offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Estoril is known for the Estoril Casino, the largest casino in Europe, and its beautiful beaches. The best time to travel to Estoril, Portugal, is from May to September, when the average air temperature is around 70-80°F (21-27°C) and the water temperature is approximately 64-72°F (18-22°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!