The best time to visit Aogashima is during the warmer months, specifically from May to September, when the weather is most favorable for travel and activities.
During this period, the chances of clear skies and calmer seas are highest, which is crucial for accessing the island by helicopter or ferry. The warmer temperatures make outdoor activities like hiking around the caldera or swimming in the geothermal sauna more comfortable. Travelers looking for a relaxing trip will appreciate the pleasant conditions.
For those interested in stargazing, the summer months offer excellent opportunities due to less cloud cover. The island's remote location provides exceptionally dark skies, making it a prime spot for astronomical observation.