Weatheo

Nagasaki Weather by Month

Average temperatures, rainfall and humidity for Nagasaki, Japan, month by month, built from OpenWeather’s historical records. Use it to see what a typical Nagasaki month looks like before you travel — then check the live Nagasaki forecast for the days ahead.

Warmest month

August

32°C average high

Coolest month

January

4°C average low

Wettest month

June

159 mm of rain

Driest month

January

41 mm of rain

Average temperature and rainfall in Nagasaki by month

Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.

MonthAvg highAvg lowRecord low / highRainfallHumidityWind
January11°C4°C-7°C / 20°C
41 mm
73%16 km/h
February12°C5°C-5°C / 20°C
73 mm
73%16 km/h
March16°C8°C0°C / 24°C
88 mm
72%14 km/h
April20°C12°C3°C / 27°C
120 mm
72%14 km/h
May24°C17°C8°C / 32°C
84 mm
75%12 km/h
June26°C21°C14°C / 32°C
159 mm
82%12 km/h
July31°C25°C19°C / 37°C
140 mm
81%12 km/h
August32°C26°C20°C / 38°C
121 mm
78%13 km/h
September29°C22°C12°C / 37°C
120 mm
78%13 km/h
October24°C17°C7°C / 32°C
65 mm
74%14 km/h
November19°C11°C0°C / 25°C
66 mm
73%14 km/h
December13°C5°C-4°C / 23°C
46 mm
72%16 km/h

Best time to visit Nagasaki

The most comfortable time to visit Nagasaki is generally May and October to November, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around June, totalling about 1,122 mm a year.

Travellers who prefer heat should aim for August, when highs average 32°C. June is the month to avoid if rain would spoil your plans — it averages 159 mm, roughly 4× the rainfall of the driest month (January).

Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Nagasaki forecast for what is happening now.

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