Saint Austell, United Kingdom offers 1 beach perfect for sunbathing, surfing, swimming, and more. Saint Austell is known for the Eden Project and the Lost Gardens of Heligan. The best time to travel to Saint Austell, United Kingdom, is from June to September, with average air temperatures around 15-20°C (59-68°F) and sea temperatures about 15-17°C (59-63°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!