Japan
Nagano in September: weather & travel advice
This month's data profile
Rain shapes the decision
Nagano in September is climatically well suited to city breaks. The average daily high is around 23 °C. With about 16 rainy days it is very wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
65/100 · #3
Warmth
#3
Dryness
#8
Sun
#7
Published best categories: Overall, City break, Family
Nagano · SeptemberPhoto: Sl-Ziga · CC BY-SA 3.0Climate facts
- Average high
- 23 °C
- Average low
- 14 °C
- Rainy days (est.)
- 16 rainy days (est.)
- Sun (est.)
- 5 h/day
- Humidity
- 83 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Score |
|---|---|---|---|---|---|---|---|---|
| August | 27 | 18 | 19 | 159 | 5.9 | 81 | 1.3 | 57 |
| September (selected) | 23 | 14 | 16 | 177 | 4.7 | 83 | 1.3 | 65 |
| October | 17 | 7 | 15 | 143 | 4.0 | 84 | 1.5 | 53 |
How do the previous and next months compare?
Baseline: September (65/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | |
|---|---|---|---|---|---|---|---|---|
| August | -8 | +4 °C | +4.2 °C | +2.5 | -17.5 mm | +1.2 h | -2.3 % | -0.1 m/s |
| October | -12 | -6.3 °C | -6.9 °C | -1.7 | -33.6 mm | -0.7 h | +1.2 % | +0.1 m/s |
All twelve months in context
Find a place to stay
Where to stay in Nagano
Compare available stays, prices and cancellation terms for Nagano on Booking.com.
Booking.comFind places to stayAffiliate link: there is no extra cost to you.
Useful next decisions
Frequently asked questions
How warm is Nagano in September?
The average daily high is around 23 °C, with an average daily low of about 14 °C.
Does it rain a lot in Nagano in September?
The curated estimate is about 16 rainy days per month, not a directly measured long-term average. Total precipitation averages around 177 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Nagano?
By the climate score, May, June and September are the strongest months for Nagano. September is one of them.