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. 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
The weather does bring rainfall during this period, between 109 mm (4.3 in) and 110 mm (4.3 in).
Plan accordingly for April, May, June, July, August and September, when conditions bring the heaviest precipitation. Need help choosing your next travel destination? We offer a specialized tool that matches you with locations based on your weather preferences. Explore destinations that suit your climate preferences.
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.
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
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