Nagasaki Weather in August
Nagasaki in August sees high daytime temperatures of 30°C (86°F) and nighttime lows of 26°C (79°F). As part of the rainy season, showers are frequent and often heavy. Budget around 188 mm (7.4 in) of rainfall for the month.
Rainfall in Nagasaki in August
Nagasaki is in the rainy season in August, with rain on around 17 days and an average of 188 mm (7.4 in). Rain during the rainy season is significant rather than just light drizzle. Expect proper showers on most rainy days.
Temperature in Nagasaki in August
Nagasaki in August gets highs of 30°C (86°F) during the day and drops to 26°C (79°F) at night. Conditions stay fairly consistent through the month, making it easier to plan what to wear. With lows around 26°C (79°F), the nights are warm enough that a sheet is usually all you need for bedding. On average, this month sees the highest temperatures of the year. Worth packing a few lighter outfits.
Sunshine in Nagasaki in August
Expect sunny days throughout the month, with an estimated 209 hours of sunshine. Despite being the rainy season, it could still be a nice time to visit. Rain often arrives later in the day, keeping most of the days sunny.
Wind Speed in Nagasaki in August
Average wind conditions reach 2 m/s (4 knots) in August. This creates comfortable weather with light winds that gently move vegetation. Keep in mind this is an average. Daily conditions range from near-calm to more noticeable wind.
Average water temperature in August
At 27°C (81°F), the water is warm and comfortable for swimming. Most people find this temperature ideal for spending longer periods in the water.August in Nagasaki has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.
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 August
Min Temperature
26°C (79°F)
Max Temperature
30°C (86°F)
Water Temperature
27°C (81°F)
Chance of Rain
56%
Precipitation
188 mm (7.4 in)
Rainy days
17 days
Humidity
77%
Windspeed
2 m/s (4 knots)
Sunshine
209 hours
Percentage Sunshine
54%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Nagasaki typically stay consistent throughout August, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 25°C (77°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 Nagasaki in August
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 August
Based on 49 years of weather observations in Nagasaki between 1976 and 2025, these are the recorded extremes.
- Nagasaki recorded its highest August temperature of 37°C (99°F) on August 6, 2023.
- The coldest August day was on August 18, 1993, with a maximum of 24°C (75°F).
- The coldest night in August in Nagasaki was on August 8, 1991, with a minimum of 16°C (61°F).
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 Nagasaki in August
Warm weather calls for comfortable, breathable clothing in August. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Also bring a poncho, it will rain a lot! Waterproof everything you can. Expect water temperatures of around 27°C (81°F), which is ideal for taking a refreshing dip. Bring swimwear and consider packing a towel for drying off. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Nagasaki 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 Nagasaki's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Nagasaki climate overview or explore weather in Japan.
