September · Japan
Best time to visit Nagasaki in September Weather, crowds & prices
Weather in Nagasaki in September
Average temperature 26°C, 215 mm of rain, about 18 days with 6+ hours of sunshine and 83% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
4.2/10
Ranked #10 of 12 months
- Avg temp
- 26°C
- Rainfall
- 215 mm
- Humidity
- 83%
- Days with 6h+ sun
- 18
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
September in Nagasaki scores 4.2/10 for sightseeing and cultural travel - ranked #10 of 12. Expect around 26°C, 215 mm of rain, and roughly 18 days with 6+ hours of sunshine this month.
Nagasaki's harbour hills hold a unique history of trade, Christianity and the atomic bombing.
September in Nagasaki: expect compromises
At 26°C (78°F) this is comfortable city weather in September, with sightseeing easiest before lunch and after the afternoon peak.
Expect monsoon-level rainfall at 215 mm: only about 18 days with 6+ hours of sunshine across the month, and stretches of heavy rain are normal.
That is 4.2/10 on the same scale — 10th of 12 months, versus 6.9/10 for the best month here.
Pack light clothing, a hat and real sun protection, a proper rain shell rather than an umbrella.
Budget for low-season pricing, and crowds are light for this destination.
If your dates are flexible, October is materially better in Nagasaki — 2.7 points higher on the same scale.
Frequently asked
- What is the weather like in Nagasaki in September?
- In September, Nagasaki averages 26°C, 215 mm of rain, and about 18 days with 6+ hours of sunshine. Its climate-comfort score is 4.2/10.
- Is September a good time to visit Nagasaki?
- September earns a 4.2/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Nagasaki in September?
- Expect about 215 mm of rain in September. Average humidity is 83% and there are about 18 days with 6+ hours of sunshine.
Curated in Nagasaki
Tickets & experiences
Things to do in Nagasaki
Nagasaki, Japan. Live activities and tours from GetYourGuide, matched to this destination.