Nagano Weather in May
May in Nagano brings pleasant temperatures, with highs of 21°C (70°F) and nights dropping to 9°C (48°F). Rainfall is on the higher side this month, averaging around 154 mm (6.1 in), so keep a rain jacket handy.
Rainfall in Nagano in May
Rain is expected on roughly 16 days, totalling around 154 mm (6.1 in) for the month. Wet weather is a regular and significant part of this month. Frequent days of rain combined with high totals means proper waterproofs are worth packing.
Temperature in Nagano in May
Expect highs of 21°C (70°F) in Nagano in May, with nights dropping to around 9°C (48°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With overnight lows of 9°C (48°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.
Sunshine in Nagano in May
There are approximately 209 hours of sunshine this month, resulting in mostly clear days.If your ideal day consists of dry skies and pleasant temperatures, May typically offers the best circumstances for Nagano.
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 May
Min Temperature
9°C (48°F)
Max Temperature
21°C (70°F)
Chance of Rain
55%
Precipitation
154 mm (6.1 in)
Rainy days
16 days
Humidity
65%
Sunshine
209 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Nagano typically stay consistent throughout May, with daily highs averaging around 21°C (70°F). Nights are cool, with lows typically ranging from 9°C (48°F) to 13°C (55°F).
Average temperatures in May
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 May
Historical weather for Nagano in May
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 May
Our historical data for Nagano spans 1976 to 2026, revealing these weather extremes.
- The hottest May day on record in Nagano reached 34°C (93°F) (May 18, 2023).
- The lowest daytime temperature in May was 9°C (48°F), recorded on May 2, 1993.
- Nighttime temperatures dropped to 2°C (36°F) on May 5, 2026, marking the coldest May night on record.
- The heaviest May precipitation occurred on May 29, 2011, when 69 mm (2.7 in) of precipitation fell.
Best Places in Japan in May
Find out more about the weather in Japan and which places have the best travel conditions in this month. See all of Japan in May →
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What to Wear in Nagano in May
Comfortable temperatures call for an easy wardrobe in May. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. It's going to pour! Pack a good poncho and prepare for very wet conditions. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Nagano in May
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.
