Diego Garcia, British Indian Ocean Territory offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Diego Garcia is known for its strategic military base and restricted access, making it unique among the British Indian Ocean Territory. The best time to travel to Diego Garcia is from May to October, with average air temperatures around 27°C (81°F) and water temperatures near 28°C (82°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!