Nagasaki weather in August
August in Nagasaki: sweltering, soaked, with clean air — a gamble, with 14 rainy days.
Updated September 2026 · climate normals from ERA5 reanalysis
#11 of 12 months in Nagasaki · #1217 of 1413 destinations to visit in August · comfort 52/100 (tier D)
- Days
- 33°C
- Nights
- 26°C
- Wet days
- 14
- Sun
- 10.2 h
- Humidity
- 84%
- Daylight
- 13 h
Traveller notes on Nagasaki in August
Other months in Nagasaki
Forum posters consistently rate April as one of the best months to visit Japan, generally warm and springlike, though posters are direct that conditions can still turn variable enough to want a coat on some days, whether from cooler temperatures or rain. Posters describe typical April days as comfortable in shirtsleeves with a light jacket in the daypack for evenings, rather than requiring a heavy winter coat, and note that on a sunny day temperatures can climb into the mid-20sC. Posters discussing Kyushu specifically, where Nagasaki sits, describe the region as reliably warm by late March into April compared with much of the rest of Japan. Posters generally rate April as a comfortable, mild time to visit Nagasaki, with a light jacket the main packing recommendation for cooler mornings and evenings.
October is widely rated one of Japan's two best months, and Kyushu — Nagasaki, Fukuoka, Kumamoto, Kagoshima — is the part of the country the forum points at when someone wants October warmth specifically. Nagasaki bears that out: days near 23°C and nights that stay unusually mild at about 18, well above what Honshu offers by then, with the sea still at 25°C. Early October runs warm and late October cools, so a light jacket for the evening covers it. The one risk worth planning around is typhoons, which can deliver a day or two of heavy rain before things return to normal.
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Nagasaki climate normals — August
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Nagasaki in August
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Peak crowdsPeace Memorial Ceremony, Summer break (natsuyasumi) in Japan, school holidays in 3 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Nagasaki's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Toughest weatherNagasaki's best weather comes in April, October and November — separate windows, not one continuous season.
August coincides with Typhoon season.
Best weatherFair weatherToughest weather
What's on in Nagasaki in August
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Rule
Gunkanjima landings are weather-called
1 Jan – 31 DecClosuresBoats to Hashima sail most days but only land when the swell allows, and the call is made at the pier. Winter is when it fails most; leave a spare day if the island is the reason you came. Source ↗
- Hazard
Typhoon season
1 Aug – 5 Oct · usuallyClosuresThe west coast of Kyushu is on the busiest approach in Japan. The Goto and Gunkanjima boats stop first and the trains follow; the mainland connection is the slowest thing to come back. Source ↗
- Holiday
Peace Memorial Ceremony
9 AugNational holidayCrowdedThe city stops at two minutes past eleven on 9 August. The ceremony fills the Peace Park and the surrounding streets, and the tram lines around it are diverted for the morning. Source ↗
Nearby, and something's on
Within 300 km of Nagasaki — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Nagasaki?
Nagasaki in August — FAQ
- Is August a good time to visit Nagasaki?
- August in Nagasaki: sweltering, soaked, with clean air — a gamble, with 14 rainy days. It ranks #11 of 12 months for Nagasaki on SeasonMap's comfort score (52/100).
- What is the weather like in Nagasaki in August?
- In August, Nagasaki averages a daily high of 32.6°C and a low of 25.8°C, with about 263.9 mm of rain over roughly 13.7 rainy days.
- What is the air quality in Nagasaki in August?
- Nagasaki has a mean US Air Quality Index of about 48 in August.
Within 300 km: Kagoshima's Kinko Bay Summer Night Fireworks on 29 Aug, and Busan's Beaches officially open around 1 Jul – 31 Aug.