Nagasaki Weather in May
Thinking of visiting Nagasaki in May? Expect pleasant temperatures reaching 22°C (72°F) during the day, dropping to 17°C (63°F) at night. Heavy showers are common during the rainy season.
Rainfall in Nagasaki in May
As part of the rainy season, Nagasaki sees around 16 days of rain in May, with an average of 191 mm (7.5 in). Rainfall this month is frequent and tends to be fairly heavy when it does fall. Packing waterproofs is a good idea.
Temperature in Nagasaki in May
Daytime temperatures in Nagasaki reach 22°C (72°F) in May, dropping to 17°C (63°F) at night. A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With overnight lows of 17°C (63°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in Nagasaki in May
There are approximately 190 hours of sunshine this month, despite being the rainy season. Rain often arrives in the late afternoon or evening, keeping mornings and early afternoons sunny. Even during the wet season, it could still be a nice time to visit.
Wind Speed in Nagasaki in May
Wind speeds average 2 m/s (4 knots) during May. At this speed, expect light breezes that you can feel on your face and cause leaves to rustle gently. Since this is an average, some days are calmer with barely any wind while others have more noticeable gentle breezes.
Average water temperature in May
At 19°C (66°F), the water is getting there — comfortable enough for most swimmers, though those used to warmer seas may still find it a touch cool.If your ideal day consists of dry skies and pleasant temperatures, October typically offers the best circumstances for Nagasaki.
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 Nagasaki's climate page.
Nagasaki Temperature in May
Min Temperature
17°C (63°F)
Max Temperature
22°C (72°F)
Water Temperature
19°C (66°F)
Chance of Rain
53%
Precipitation
191 mm (7.5 in)
Rainy days
16 days
Humidity
72%
Windspeed
2 m/s (4 knots)
Sunshine
190 hours
Percentage Sunshine
43%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Nagasaki typically stay consistent throughout May, with daily highs averaging around 22°C (72°F). Nights are pleasant, with lows typically ranging from 14°C (57°F) to 18°C (64°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 Nagasaki in May
Browse day-by-day weather records for Nagasaki spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Nagasaki historical weather extremes in May
Our historical data for Nagasaki spans 1976 to 2026, revealing these weather extremes.
- The warmest day in May was on May 31, 1983, with a maximum of 31°C (88°F).
- On May 1, 1983, Nagasaki saw its coldest May day with temperatures maxing out at 14°C (57°F).
- The lowest overnight temperature recorded in May was 6°C (43°F) (May 2, 1980).
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 Nagasaki 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. With water temperatures around 19°C (66°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Nagasaki 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 Nagasaki's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Nagasaki climate overview or explore weather in Japan.
