Kilwa Masoko, Tanzania offers 1 beach perfect for sunbathing, surfing, swimming, and more. Kilwa Masoko, Kilwa Kisiwani Ruins. Dar es Salaam, National Museum of Tanzania. Tanzania, Serengeti National Park. The best time to travel to Kilwa Masoko, Tanzania, is from June to October, when the average air temperature is around 25-30°C (77-86°F) and the water temperature is approximately 25-28°C (77-82°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!