Sinma, Myanmar offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Sinma, Ayeyarwady, Myanmar, is known for its proximity to the Irrawaddy River and the scenic beauty of the surrounding delta region. The best time to travel to Sinma, Myanmar, is from November to February, with average air temperatures around 25°C (77°F) and water temperatures near 24°C (75°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!