SeasonMapNagano weather in August
Japan
August in Nagano: hot, soaked, with clean air — fine if you can take 22 rainy days.
#7 of 12 months in Nagano · #1010 of 1383 destinations to visit in August · comfort 65/100 (tier C)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Nagano in August
No notes yet. Open Nagano on the map to add the first one.
Nagano climate normals — August
| Daytime high | 29°C / 84°F | 🥵 hot |
|---|---|---|
| Nighttime low | 21°C / 70°F | |
| Rainfall | 205 mm / 8.1 in | ⛈ soaked |
| Rainy days | 22 days | |
| Humidity | 83% | 💦 very humid |
| Dew point | 21°C / 70°F | |
| Sunshine | 9.6 h/day | |
| Daylight | 13.5 h | |
| Wind | 8 km/h / 5 mph | |
| Air quality (US AQI) | 36 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Nagano in August
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusySummer break (natsuyasumi) in Japan, school holidays in 3 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Nagano's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherNagano's best weather comes in May, June and September — separate windows, not one continuous season.
Best weatherFair weatherToughest weather
What's on in Nagano in August
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Wet season
MonsoonRisk22 rainy days and about 205 mm in the month — the real kind of rainy season, not afternoon showers.
from the climate normals
Nearby, and something's on
Within 300 km of Nagano — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Nagano?
Nagano in August — FAQ
- Is August a good time to visit Nagano?
- August in Nagano: hot, soaked, with clean air — fine if you can take 22 rainy days. It ranks #7 of 12 months for Nagano on SeasonMap's comfort score (65/100).
- What is the weather like in Nagano in August?
- In August, Nagano averages a daily high of 29°C and a low of 21°C, with about 204.9 mm of rain over roughly 22 rainy days.
- What is the air quality in Nagano in August?
- Nagano has a mean US Air Quality Index of about 36 in August.
Other months in Nagano
Compare Nagano in August
Warmer or cooler than Nagano in August
Similar destinations in East Asia — August
Within 300 km: Hakuba's High trails and huts open around 1 Jul – 15 Oct, and Matsumoto's Kamikochi open season around 17 Apr – 15 Nov.