Nagasaki Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Nagasaki.
Climate overview of Nagasaki
Nagasaki, Nagasaki, Japan, sees big temperature differences between seasons, with August peaking at 30°C (86°F) and January dropping to 12°C (54°F).
Rainfall is high, totalling around 2226 mm (88 in) per year. June is the wettest month and January the driest. The city also experiences a distinct rainy season from April to September, with warm summers and cold winters. Sunshine peaks in August, when the city sees around 7.0 hours of sunshine per day.
Nagasaki Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Nagasaki - and find the best time to visit.
Monthly Temperature in Nagasaki
Visitors to Nagasaki can expect significant temperature changes throughout the year. Average maximum daytime temperatures range from a comfortable 30°C (86°F) in August, the warmest time of the year, to a chilly 12°C (54°F) during cooler months like January.
At night, you can expect temperatures ranging from 26°C (79°F) in August to around 7°C (45°F) during January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Nagasaki
Nagasaki is known for its substantial rainfall, with annual precipitation reaching 2226 mm (88 in). Significant seasonal changes in precipitation occur throughout the year. In the wettest month, June it receives heavy rainfall, averaging 451 mm (18 in) of precipitation, recorded across 19 rainy days. In contrast, the driest month January brings less rainfall, with 91 mm (3.6 in) over 21 rainy days. For more details, please visit our Nagasaki 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 Nagasaki
Seasonal changes in sunshine hours are quite dramatic in Nagasaki. While August receives considerable daily sunshine with up to 7.0 hours, January marks the darkest time of the year, where sunshine is scarce 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
Water Temperature in Nagasaki
The mean water temperature over the year ranges from 14°C (57°F) in February to 27°C (81°F) in August.
Water temperature over the year
Humidity in Nagasaki by Month
The relative humidity is high throughout the year in Nagasaki.
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
Wind Speed in Nagasaki
The mean wind speed over the year ranges from 1 m/s (2 knots) in September and October to 2 m/s (4 knots) in January, February, March, April, May, June, July, August, November and December. What does this mean?
The mean monthly wind speed over the year (meters per second)
Best Time to Visit Nagasaki
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: October
- Warmest weather: August
- Most sunshine: August
- Fewest rainy days: May, October and November
- Best for swimming: June, July, August, September, October and November.
- Wettest months: May, June, July, August and September, when rainfall is highest.
- Seasonal pattern: A distinct rainy season from April to September, with warm summers and cold winters
Frequently asked questions about the climate in Nagasaki
What is the best time to visit Nagasaki?
October typically offers the most optimal weather in Nagasaki. In contrast, February, June, July and August tend to have less optimal conditions. Nagasaki has a distinct rainy season from April to September, with warm summers and cold winters.
What temperatures can I expect in Nagasaki?
Daytime highs range from 12°C (54°F) in January to 30°C (86°F) in August. Nighttime lows range from 7°C (45°F) to 26°C (79°F). Temperatures vary considerably through the year.
How much rain does Nagasaki get?
Annual rainfall is around 2226 mm (88 in). June is the wettest month with 451 mm (18 in), while January is the driest with 91 mm (3.6 in).
How sunny is Nagasaki?
Nagasaki 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.
Nagasaki 3-Day Forecast
Nagasaki 3-Day Forecast
Nagasaki on the map
Nagasaki is highlighted - select any city to see its climate.
Popular this month
Where to go in July - average daytime high across popular destinations.
Osaka
32°C (90°F) Tokyo30°C (86°F) Naha
30°C (86°F) Kyoto31°C (88°F) Hakone28°C (82°F) Hakuba26°C (79°F) Sapporo24°C (75°F) Niseko24°C (75°F) 
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Chase the autumn leaves in Japan
Japan is one of these cases which turns into a gold, yellow and orange fairy tale starting from September. And we can honestly say: We cannot imagine a more beautiful season to visit Japan.
Walk the 88 temple circuit
We recommend walking the 88 temple circuit from April til October. Although June, July and August can be a bit wet, hot and humid.
The famous bamboo forests of Arashiyama
The famous bamboo forests of Arashiyama lie just outside the city center of Kyoto and is unique in the world. If you look at photos of this bamboo forest, it looks like you have landed in a fairy-tale world.
10 reasons why you should visit Japan in winter
Here are 10 reasons why you should plan a winter trip to Japan. During this period, popular sights are less busy and prices for flights and hotels much cheaper.