Unzen Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Unzen.
Climate overview of Unzen
Unzen, Nagasaki, Japan, experiences significant temperature variation throughout the year. Summers bring daytime highs of 32°C (90°F) in August, while winters cool to 11°C (52°F) in January.
With around 2207 mm (87 in) of annual rainfall, Unzen has a notably wet climate. However, this rainfall is not evenly distributed, the city has a distinct rainy season from May to September, with very warm summers and cold winters. The wettest month is June. The sunniest month is August, with 7.0 hours of sunshine per day on average.
Unzen Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Unzen - and find the best time to visit.
Monthly Temperature in Unzen
Depending on the time of the year, temperatures range from very warm to chilly in Unzen. Average daytime temperatures reach a very warm 32°C (90°F) in August. In January, the coolest month of the year, temperatures drop to a chilly 11°C (52°F).
At night, temperatures range from around 25°C (77°F) in August to 5°C (41°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Unzen
Unzen has a relatively rainy climate with high precipitation levels, averaging 2207 mm (87 in) of rainfall annually. Unzen can be quite wet during June, receiving approximately 453 mm (18 in) of precipitation over 19 rainy days.
In contrast, during the driest month (January), you will experience much drier conditions, with 80 mm (3.1 in) of precipitation spread across 19 rainy days. For more details, please visit our Unzen 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 Unzen
Unzen can be enjoyed more throughout the sunniest month of August under a blue sky, with approximately 7.0 hours of sunshine daily. In contrast, the city experiences much darker days in January, with only 3.5 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
Humidity in Unzen by Month
The relative humidity is high throughout the year in Unzen.
The city experiences its highest humidity in June, reaching 80%. In February, the humidity drops to its lowest level at 65%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Unzen
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: April and October
- Warmest weather: August
- Most sunshine: August
- Fewest rainy days: May, October and November
- Wettest months: May, June, July, August and September, when rainfall is highest.
- Seasonal pattern: A distinct rainy season from May to September, with very warm summers and cold winters
Frequently asked questions about the climate in Unzen
What is the best time to visit Unzen?
April and October typically offer the most optimal weather in Unzen. In contrast, February, June, July and August tend to have less optimal conditions. Unzen has a distinct rainy season from May to September, with very warm summers and cold winters.
What temperatures can I expect in Unzen?
Daytime highs range from 11°C (52°F) in January to 32°C (90°F) in August. Nighttime lows range from 5°C (41°F) to 25°C (77°F). Temperatures vary considerably through the year.
How much rain does Unzen get?
Annual rainfall is around 2207 mm (87 in). June is the wettest month with 453 mm (18 in), while January is the driest with 80 mm (3.1 in).
How sunny is Unzen?
Unzen receives around 1,876 hours of sunshine per year. August is the sunniest month with 209 hours, while January is the cloudiest with just 104 hours.
Unzen 3-Day Forecast
Unzen on the map
Unzen is highlighted - select any city to see its climate.
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