Nagasaki weather
Today's sky, the hour-by-hour rain chance and the 16-day forecast for Nagasaki, Japan. Like most weather services, we show Nagasaki at one spot: Nagasaki, its largest city. At 8:45 AM local time it was clear and 18°C (64°F). Mostly light, on-and-off rain; heavier around 4 AM (10.6 mm total). Best months for weather: Oct–Nov.
Current conditions
- Clouds
- 3%
- Chance of rain
- 0%
- Rain
- 0.0 mm/h
Hourly Forecast
Mostly light, on-and-off rain; heavier around 4 AM (10.6 mm total)
Daily Forecast
Best Time to Visit
Peak season Oct–NovOff season Jun–Jul, Dec–Feb
About Nagasaki weather
Is it raining in Nagasaki right now?
No. It’s clear and 18° right now. Mostly light, on-and-off rain; heavier around 4 AM (10.6 mm total).
What’s the weather like in Nagasaki this week?
Over the next 7 days, expect highs of 16–24° and lows of 10–17°. Rain is likely on 3 of 7 days (Sunday, Monday, Thursday). The driest day looks like Tuesday.
Has it been raining in Nagasaki lately?
In the past 7 days, Nagasaki had 4 rainy days and 99.0 mm of rain in total.
What should I pack for Nagasaki?
For the coming week, bring an umbrella or rain jacket and a warm layer for the evenings.
Nagasaki weather by month
When is the best time to visit Nagasaki?
Based on weather alone, the best time to visit Nagasaki is Oct–Nov, according to NASA's 2001–2025 climate averages. Jun–Jul, Dec–Feb tends to be the least pleasant. Average highs run from 9°C (48°F) in January to 30°C (87°F) in August.
What is the rainiest month in Nagasaki?
July is the wettest month, with about 352 mm (13.9 in) of rain on average. January is the driest, with about 71 mm (2.8 in).
What is the hottest month in Nagasaki?
August is the warmest, with average highs of 30°C (87°F) and lows of 24°C (74°F). January is the coolest, with highs of 9°C (48°F) and lows of 3°C (37°F).
How warm is the sea in Nagasaki?
The sea is warmest in August at about 30°C (86°F) and coolest in February at about 15°C (59°F). It is comfortable for swimming (22°C or more) in Jun–Nov.
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis for Nagasaki), sea temperature from Open-Meteo Marine, forecast and current conditions from Open-Meteo. Page updated . How we rate months
Compare places in Nagasaki
Weather can differ a lot within Nagasaki: coasts, hills and mountains each have their own climate.
| Place | Best months | Rainy months | Highs | Rain a year |
|---|---|---|---|---|
| Nagasaki | Oct–Nov | Apr–Sep | 9–30°C | 2,077 mm |
| Sasebo | Oct–Nov | Apr–Sep | 9–30°C | 2,077 mm |
| Isahaya | Oct–Nov | Apr–Sep | 9–30°C | 2,077 mm |
| Ōmura | Oct–Nov | Apr–Sep | 9–30°C | 2,077 mm |
| Obita | Oct–Nov | Apr–Sep | 9–30°C | 2,077 mm |
| Shimabara | Oct–Nov | Apr–Sep | 8–30°C | 2,131 mm |
| Minamishimabara | Oct–Nov | Apr–Sep | 11–30°C | 2,156 mm |
| Unzen | Oct–Nov | Apr–Sep | 9–30°C | 2,077 mm |
| Gotō | Oct–Nov | Apr–Sep | 12–29°C | 1,945 mm |
| Hirado | Oct–Nov | Apr–Sep | 10–28°C | 1,971 mm |
| Iki | Oct–Nov | Apr–Sep | 10–28°C | 1,944 mm |
| Togitsu | Oct–Nov | Apr–Sep | 9–30°C | 2,077 mm |