The month in detail
What to expect in September
Autumn in Nagasaki is often underrated: 28°C, golden light and declining crowds. An interesting window. Expect rain on 36% of days — a light raincoat in the bag is recommended.
September is the best month of the year in Nagasaki. Compared to August: −3°C daytime, −1.0h of sun per day.
This month's conditions
What it's like in September
UV index
7 · high
sunscreen and hat advised
Feels like
very humid
21°
Sea
30°C
warm, ideal
Daylight
12.2h of daylight
Air quality
good
AQI 36
Compare
Is September the right month?
September is actually the best month of the year in Nagasaki. Good timing.
Book
Plan your trip
Hotels at their lowest outside peak season, highest on comfortable months. Shoulder seasons offer a good price/climate compromise.
Stay
Hotels & rentals · Nagasaki
Expedia →
Activities
Tours, tickets, experiences
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Flights
Multi-airline comparator
Kiwi →
🎟️ Activities & tours · Nagasaki
GetYourGuide selection · free cancellation
Practical info
What you need to know before you go
Three angles: the country (language, currency, safety, budget), the year-round climate, and the specifics of a beach holiday.
Country · Japan
🗣️LanguageJapanese
💶CurrencyYen japonais (¥)
🚗DrivingLeft-hand
🛡️Safety ⓘSafe · 2/5
💰Cost of living ⓘModerate · 3/5
🌡️ Climate
🌍Climate typeTemperate oceanic
📈Climate trend ⓘStable
🔥Hottest monthAugust · 31°C
❄️Coolest monthJanuary · 11°C
🌧️Rainiest month ⓘJuly · 43%
🏖️ Beach holiday
📅Peak seasonJuin → Sept
🏖️Swell (Sept–Mar) ⓘModérée
Explore
Other destinations in September
If September doesn't convince you for this destination, compare with others.
Location
Where is Nagasaki ?
Global position + regional geographic context.
🌍 World
🔍 Geographic context
JapanTemperate oceanic climate with a 8.0 → 4.1 gap between best and worst month. 10 years of ERA5 data to choose by project.
32.75°N · 129.88°E
Questions
Frequently asked questions
What is the best time to visit Nagasaki?
September is the best month with 28.0°C highs, 23.0°C lows, 5.7h of sunshine and 36.0% rainy days. The months of September & October offer comparable conditions.
How many hours of sunshine does Nagasaki get in September?
Nagasaki averages 5.7 sunshine hours per day in September. It is the sunniest month with a climate score of 7.5/10.
What is the rainiest month in Nagasaki?
January is the most unfavourable month with January has the lowest climate score of the year and the lowest climate score of the year.
What are the temperatures at night in Nagasaki in September?
In September, overnight lows reach 23.0°C, while afternoon highs average 28.0°C.
Is Nagasaki good in winter?
In winter (December-February), Nagasaki scores 4.0/10 on average — Difficult period — prefer the peak season.. The best month overall remains September with a score of 7.5/10.
When should you avoid Nagasaki?
January is the most difficult month to visit Nagasaki, with January has the lowest climate score of the year. Climate conditions are at their lowest of the year during this period.
Can you swim in Nagasaki in September?
In September, the sea averages 30°C in Nagasaki: warm, ideal. Ideal conditions for swimming and snorkeling.
Do you need sun protection in Nagasaki in September?
The average UV index reaches 7 in September in Nagasaki (high), with about 12.2h of daylight. Sunscreen and hat advised.