April October is the best time for Okinawa tourism. Okinawa is the only subtropical marine climate area in Japan. The temperature in the four seasons does not fluctuate greatly and it is very warm. The annual average temperature is 22.7 ℃ / 73 ° F, and the average temperature in October is 24.9 ℃ / 77 ° F. So, you can come here for a long time from April to October and enjoy comfortable bathing and sea activities.