Momi, Fiji offers 1 beach perfect for sunbathing, surfing, swimming, and more. Momi, Western, Fiji, is known for the Momi Bay Gun Site, a historic World War II coastal defense installation. The best time to travel to Momi, Fiji, is from May to October, when the average air temperature is around 77°F (25°C) and the water temperature is approximately 79°F (26°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!