Weather in Hachijojima

Planning your day on Hachijojima Island? Check out the most up-to-date weather information, including detailed charts and forecasts, presented below.

The climate of Hachijojima can be characterised as humid subtropical, strongly influenced by the warm ocean current. This creates an atmosphere of "eternal spring" on the island: there are practically no frosts here, and the average temperature even in the coldest months — January and February — holds at a comfortable mark around 13°C. Such mild weather makes the island an attractive destination for those wishing to avoid the harsh winter characteristic of many other regions of Japan.

Summer on the island is warm, but not extremely hot, with temperatures reaching a maximum of 27–28°C in August. This is the ideal time for a beach holiday and exploring nature. However, tourists should be prepared for frequent rainfall: the number of rainy days is high throughout the year, especially in autumn (in October there can be up to 22 days with precipitation). High humidity is a constant companion of the local climate.

Overall, the weather here is distinguished by enviable stability and a lack of sharp temperature changes. When planning a trip, it is worth considering the high probability of rain in any season and always having an umbrella or raincoat on hand. Despite the whims of the weather, the warm and humid air promotes the lush growth of vegetation, turning the island into a true green oasis.

The climate of Hachijojima can safely be called mild and subtropical, making the island an attractive destination all year round. The coolest months are January and February, when the average air temperature hovers around 13°C. Winter here is completely unlike the usual seasonal cold: even on the coldest nights, the thermometer rarely drops below 12°C, so travellers will not need heavy warm clothing.

The summer season brings pleasant warmth, but without the extreme heat characteristic of mainland Japan. August is considered the hottest month with an average temperature of about 27–28°C. July and September also delight with stable warmth above 26°C. Thanks to the constant sea breeze, summer weather feels comfortable, although humidity can be high.

A characteristic feature of the local temperature regime is the minimal difference between day and night readings. Diurnal temperature fluctuations are extremely insignificant — often the gap between minimum and maximum is only 1–2 degrees. This creates unique conditions where evenings remain as warm as the days, ensuring a stable and predictable atmosphere for relaxation at any time of day.

The climate on the island of Hachijojima is characterised by high humidity, and precipitation falls regularly throughout the year. Thanks to mild temperature conditions, where even in winter the thermometer rarely drops below 12°C, snow is an extremely rare phenomenon. Rain is the main type of precipitation, so tourists are advised to carry an umbrella or raincoat regardless of the travel season.

According to statistics, the highest amount of precipitation falls in early summer and mid-autumn. June stands out with the highest level of rainfall (about 12 mm), marking the rainy season. In autumn, October becomes the "wettest" month in terms of rain frequency, when up to 22 rainy days are recorded. September and November are also characterised by frequent rainfall, counting about 18–19 inclement days.

The most favourable time to visit from a weather perspective is the second half of summer. In July and August, the number of rainy days drops to a minimum (10–12 days), and the volume of precipitation in August reaches its annual minimum — just about 3 mm. May can also be called a relatively dry month, offering travellers more clear days to explore the natural beauties of the island.

When packing for Hachijojima, it is worth considering the island's mild subtropical climate, where even in winter the temperature rarely drops below +12°C. You are unlikely to need heavy winter items here, but due to frequent sea winds, a windproof jacket will become your best friend in almost any season. For trips in spring and autumn, it is ideal to stick to the principle of layering: a combination of light T-shirts with warm cardigans or fleece sweaters will allow you to feel comfortable and quickly adapt to weather changes.

Pay special attention to protection against moisture, as rainy days on the island happen often — statistics show from 10 to 22 days with precipitation per month, peaking in October. Be sure to take a reliable umbrella or a high-quality raincoat, as well as comfortable waterproof shoes for walking. In the summer months, when the air warms up to +28°C, the weather becomes more favourable, so do not forget sunscreen, a hat, and swimwear for relaxing on the coast.