Nagano Weather in August
Nagano in August averages 29°C (84°F) during the day and 19°C (66°F) at night. August is part of the rainy season, so frequent rainfall is typical.
Rainfall in Nagano in August
As part of the rainy season, Nagano sees around 19 days of rain in August, with an average of 194 mm (7.6 in). Rainy season showers tend to be fairly substantial. A good rain jacket or umbrella is worth having with you most days.
Temperature in Nagano in August
Daytime highs in Nagano in August reach 29°C (84°F), with nights around 19°C (66°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. Nights drop to around 19°C (66°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable. This month tends to be the warmest of the year. Light, comfortable clothing will serve you well.
Sunshine in Nagano in August
Expect a lot of sunshine this month, with about 206 hours of sun. Showers typically arrive in the late afternoon or evening, keeping mornings and early afternoons sunny. Even during the wet season, there's plenty of sunshine for sightseeing.Should you favor a climate that's both dry and comfortably warm, May typically offers the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Japan, check out our Nagano's climate page.
Nagano Temperature in August
Min Temperature
19°C (66°F)
Max Temperature
29°C (84°F)
Chance of Rain
62%
Precipitation
194 mm (7.6 in)
Rainy days
19 days
Humidity
72%
Sunshine
206 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Nagano typically stay consistent throughout August, with daily highs averaging around 29°C (84°F). Nights are warm, with lows typically ranging from 20°C (68°F) to 22°C (72°F).
Average temperatures in August
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in August
Historical weather for Nagano in August
Browse day-by-day weather records for Nagano spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Nagano historical weather extremes in August
According to our 49 years of weather records for Nagano, the following extremes were recorded between 1976 and 2025.
- The hottest August day on record in Nagano reached 38°C (100°F) (August 16, 1994).
- The lowest daytime temperature in August was 18°C (64°F), recorded on August 28, 1996.
- Nighttime temperatures dropped to 13°C (55°F) on August 18, 2018, marking the coldest August night on record.
Best Places in Japan in August
Find out more about the weather in Japan and which places have the best travel conditions in this month. See all of Japan in August →
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What to Wear in Nagano in August
Warm temperatures in August make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Nagano in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Japan, check out our Nagano's climate page.
Temperature Rainfall Sunshine Humidity
See the full Nagano climate overview or explore weather in Japan.
