Nagasaki Weather and Climate: A Comprehensive Guide
The temperature in Nagasaki can vary quite a bit throughout the year.
Temperatures can be warm during the warmest months,
and cold during the cooler months.
It also has a notably wet climate with much precipitation.
Let’s explore the climate details in depth to provide you with a complete overview.
Average maximum day and minimum night temperature
Visitors to Nagasaki can expect significant temperature changes throughout the year. Average maximum daytime temperatures range from a comfortable 30°C in August, the warmest time of the year, to a chilly 12°C during cooler months like January.
At night, temperatures typically drop to an average of around 7°C during these months.Check out our detailed temperature page for more information.
Temperature ranges by month
Precipitation and rainy days
Nagasaki is known for its substantial rainfall, with annual precipitation reaching 2226 mm. Significant seasonal changes in precipitation occur throughout the year. During the wetter season, June receives heavy rainfall, averaging 451 mm of precipitation, recorded across 19 rainy days. In contrast, the drier season, January brings less rainfall, with 91 mm 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 over the year
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
Average water temperature
The mean water temperature over the year ranges from 14°C in February to 27°C in August.
Water temperature over the year
Average humidity
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
Average wind speed
The mean wind speed over the year ranges from 1 m/s in September and October to 2 m/s in January, February, March, April, May, June, July, August, November and December.
The mean monthly wind speed over the year (meters per second)
broken clouds and no rain broken clouds and rain broken clouds and rainForecast for Nagasaki
4 m/s
5 m/s
5 m/s
Select a Month of Interest
Check the conditions for any month of the year.
The best time of year to visit Nagasaki in Japan
During the months of May, June and October you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
The hottest season / summer takes place in June, July, August and September.
August has an average maximum temperature of 30°C and is the warmest month of the year.
The coldest month is January with an average maximum temperature of 12°C.
June tops the wettest month list with 451 mm of rainfall.
January is the driest month with 91 mm of precipitation.
August is the sunniest month with an average of 209 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
