Hachijojima Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Hachijojima.
Climate overview of Hachijojima
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 two distinct rainy seasons, May to July and September to November, with warm summers and mild winters. The wettest month is June. The sunniest month is August, with 6.2 hours of sunshine per day on average.
Hachijojima Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Hachijojima - and find the best time to visit.
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. 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)
Best Time to Visit Hachijojima
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: April, May, July and August
- Warmest weather: July, August and September
- Most sunshine: August
- Fewest rainy days: January, February, November and December
- Best for swimming: May, June, July, August, September, October, November and December.
- Seasonal pattern: Two distinct rainy seasons, May to July and September to November, with warm summers and mild winters
Frequently asked questions about the climate in Hachijojima
What is the best time to visit Hachijojima?
April, May, July and August typically offer the most optimal weather in Hachijojima. In contrast, June and October tend to have less optimal conditions. Hachijojima has two distinct rainy seasons, May to July and September to November, with warm summers and mild winters.
What temperatures can I expect in Hachijojima?
Daytime highs range from 16°C (61°F) in February to 29°C (84°F) in August. Nighttime lows range from 11°C (52°F) to 27°C (81°F). Temperatures vary considerably through the year.
How much rain does Hachijojima get?
Annual rainfall is around 2300 mm (91 in). June is the wettest month with 323 mm (13 in), while August is the driest with 116 mm (4.6 in).
How sunny is Hachijojima?
Hachijojima receives around 1,474 hours of sunshine per year. August is the sunniest month with 187 hours, while January is the cloudiest with just 87 hours.
Hachijojima 3-Day Forecast
Hachijojima on the map
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