Soma, Japan offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Soma is known for the Soma Nomaoi festival, a traditional horse-racing event with samurai costumes. The best time to travel to Soma, Japan, is in late spring (May), when the average air temperature is around 18°C (64°F) and the water temperature is approximately 15°C (59°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!