Hachijojima Weather & Climate: Best Time to Visit
Hachijojima, Japan, sees big temperature differences between seasons, with August peaking at 29°C (84°F) and February dropping to 16°C (61°F).
With around 2300 mm (91 in) of annual rainfall, Hachijojima has a notably wet climate. However, this rainfall is not evenly distributed — the city has a distinct rainy season from September to July. The wettest month is June. The sunniest month is August, with 6.2 hours of sunshine per day on average.
Monthly Temperature in Hachijojima
Visitors to Hachijojima can expect significant temperature changes throughout the year. Average daytime temperatures reach a comfortable 29°C (84°F) in August. In February, the coolest month of the year, temperatures drop to a moderate 16°C (61°F).
At night, temperatures range from around 27°C (81°F) in August to 11°C (52°F) in February.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Hachijojima
Hachijojima is known for its substantial rainfall, with annual precipitation reaching 2300 mm (91 in). Hachijojima can be quite wet during June, receiving approximately 323 mm (13 in) of precipitation over 19 rainy days.
In contrast, during the driest month (August), you will experience much drier conditions, with 116 mm (4.6 in) of precipitation spread across 16 rainy days days. For more details, please visit our Hachijojima Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Hachijojima
Hachijojima can be enjoyed more throughout the sunniest month of August under a blue sky, with approximately 6.2 hours of sunshine daily. In contrast, the city experiences much darker days in January, with only 2.9 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Water Temperature in Hachijojima
The mean water temperature over the year ranges from 17°C (63°F) in March to 27°C (81°F) in August.
Water temperature over the year
Humidity in Hachijojima by Month
The relative humidity is high throughout the year in Hachijojima.
The city experiences its highest humidity in July, reaching 92%. In January, the humidity drops to its lowest level at 67%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Wind Speed in Hachijojima
The average wind speed over the year ranges from 4 m/s (8 knots) to 6 m/s (12 knots). It is lower in July and August and higher in January, February, March and December. What does this mean?
The mean monthly wind speed over the year (meters per second)
Hachijojima 3-Day Forecast
Check the conditions for any month of the year.
Best Time to Visit Hachijojima
During April, August and December, Hachijojima experiences its most favorable weather, with temperatures between 18°C (64°F) and 29°C (85°F). These mild conditions make it an excellent time for a visit.The weather does bring rainfall during this period, between 116 mm (4.6 in) and 153 mm (6 in).
Plan accordingly for February, March, May, June, July, September, October and November, when conditions bring the heaviest precipitation. Ready to plan your travels but need destination ideas? Our smart tool recommends places based on the climate conditions you prefer. Start planning with our destination weather tool.
