Hachijo Weather & Climate: Best Time to Visit
Hachijo, Japan, experiences significant temperature variation throughout the year. Summers bring daytime highs of 29°C (84°F) in August, while winters cool to 16°C (61°F) in February.
With around 2300 mm (91 in) of annual rainfall, Hachijo 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 Hachijo
Depending on the time of the year, temperatures range from comfortable to moderate in Hachijo. 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 Hachijo
Hachijo has a relatively rainy climate with high precipitation levels, averaging 2300 mm (91 in) of rainfall annually. Hachijo 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 Hachijo 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 Hachijo
Hachijo 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 Hachijo
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 Hachijo by Month
The relative humidity is high throughout the year in Hachijo.
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 Hachijo
The mean wind speed varies between 4 m/s (8 knots) and 6 m/s (12 knots) throughout the year. It is lowest in July and August and highest during January, February, March and December. What does this mean?
The mean monthly wind speed over the year (meters per second)
Hachijo 3-Day Forecast
Check the conditions for any month of the year.
Best Time to Visit Hachijo
During the months of April, August and December, Hachijo enjoys pleasant weather with average temperatures ranging from 18°C (64°F) to 29°C (85°F). These months are perfect for sightseeing and exploring.Rainfall during this time ranges from 116 mm (4.6 in) in August to 153 mm (6 in) in April. This means you can expect a mix of sunny days and occasional showers.
The rainy season falls during February, March, May, June, July, September, October and November, bringing heavy precipitation. Wondering where to travel based on your weather preferences? Our recommendation tool helps you find destinations with your ideal climate conditions. Use our weather planner to find your perfect destination.
