September · Japan
Best time to visit Nagano in September Weather, crowds & prices
Weather in Nagano in September
Average temperature 22°C, 122 mm of rain, about 25 days with 6+ hours of sunshine and 81% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
8.0/10
Ranked #4 of 12 months
- Avg temp
- 22°C
- Rainfall
- 122 mm
- Humidity
- 81%
- Days with 6h+ sun
- 25
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Nagano scores 8.0/10 for nature and wildlife travel - an above-average month (#4 of 12). Expect around 22°C, 122 mm of rain, and roughly 25 days with 6+ hours of sunshine this month.
Nagano's Olympic legacy, mountain temples and ski fields fill the Japanese Alps' gateway.
September in Nagano: strong conditions, 4th of 12
September averages 22°C (72°F) — warm for the outdoors: start trails early, use shaded routes at midday, and carry more water than you think you need.
Monthly rainfall reaches 122 mm — wet for this destination — but about 25 days with 6+ hours of sunshine still break through, so keep one indoor fallback in the plan.
It scores 8/10 here, 4th of 12 months, against 8.7/10 in the destination's best month.
Pack light clothing, a hat and real sun protection, a proper rain shell rather than an umbrella, footwear you can get muddy.
Figure on mid-season pricing, with crowds are moderate.
Frequently asked
- What is the weather like in Nagano in September?
- In September, Nagano averages 22°C, 122 mm of rain, and about 25 days with 6+ hours of sunshine. Its climate-comfort score is 8.0/10.
- Is September a good time to visit Nagano?
- September earns a 8.0/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Nagano in September?
- Expect about 122 mm of rain in September. Average humidity is 81% and there are about 25 days with 6+ hours of sunshine.
Curated in Nagano
Tickets & experiences
Things to do in Nagano
Nagano, Japan. Live activities and tours from GetYourGuide, matched to this destination.