Weather
- Summers (June–August) average around 30 degrees Celsius plus humidity. There usually is a strong sea breeze. The sea waves during the summer rarely exceed 2 meters.
- Autumn (September–November) is temperate. It begins to rain more often and the waves begin to grow. The Rainbow ferry stops operating in November.
- Winters (December to the end of February) are relatively mild. Temperatures rarely drop below freezing. Also, due to the warming influence of the sea, Oki does not get much snow. What snow there is does not lie for long because the ground is not cold enough. The ferry is more likely to be canceled due to high waves, but it is still possible to leave the island.
- Spring (March–May) is generally regarded as the best season. There are many opportunities for viewing cherry blossoms on Oki during the spring. The Rainbow starts running in March.
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