Nagano weather in August
Temperature, rain and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Fair
Best time to visit: May – June, October
What is the weather like in Nagano in August?
In August, Nagano is hot: daytime highs average 29 °C, and even at night it stays warm at around 21 °C. The sun shines for around 7 hours a day. It rains often – on about 21 days, adding up to 208 mm. On about 12 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, August is a so-so month for a holiday in Nagano.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 54 | 50 | 58 |
| Day | 28° | 29° | 25° |
| Night | 20° | 21° | 17° |
| Sun | 5 h | 7 h | 5 h |
| Rain days | 22 | 21 | 18 |
More details for August
- Daylight
- 13 h 36 min05:04 – 18:40
- UV index
- 9 · very highclear sky, noon (estimate)All months
- Muggy days
- 26 daysdew point 18 °C or moreAll months
- Wind
- 9 km/haverage daily peakAll months
- Cloud cover
- 68 %on averageAll months
- Hot days
- 12 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC+9Asia/Tokyo
How the score comes together
- Temperatureweight 50 %76 %
- Sunshineweight 20 %58 %
- Few rainy daysweight 30 %0 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in August
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Nagano in August: quick answers
Is Nagano hot in August?
Yes. In August, Nagano is hot: daytime highs average 29 °C and nights stay around 21 °C. On about 12 days the thermometer climbs to 30 °C or more.
Does it rain much in Nagano in August?
It rains often – on about 21 days, adding up to 208 mm.
Nagano month by month
The whole year in NaganoAll destinations: JapanWhere to go in August
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences