Nagasaki weather by month

Warmest month

August

32°C average high

Coolest month

January

4°C average low

Wettest month

June

158 mm of rain

Driest month

January

45 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.

Month	Avg high	Avg low	Record low / high	Rainfall	Humidity	Wind
January	11°C	4°C	-4°C / 20°C	45 mm	74%	15 km/h
February	12°C	5°C	-2°C / 20°C	67 mm	75%	16 km/h
March	16°C	8°C	0°C / 22°C	89 mm	71%	14 km/h
April	19°C	12°C	4°C / 25°C	122 mm	73%	14 km/h
May	24°C	17°C	10°C / 30°C	82 mm	73%	13 km/h
June	26°C	20°C	16°C / 31°C	158 mm	82%	11 km/h
July	30°C	25°C	20°C / 36°C	141 mm	82%	12 km/h
August	32°C	26°C	20°C / 37°C	119 mm	78%	13 km/h
September	30°C	23°C	18°C / 36°C	115 mm	77%	13 km/h
October	24°C	17°C	8°C / 30°C	67 mm	73%	14 km/h
November	19°C	11°C	3°C / 25°C	65 mm	71%	14 km/h
December	13°C	5°C	-1°C / 23°C	45 mm	70%	17 km/h

Frost and snow-likely months in Nagasaki

No month in Nagasaki averages a night of 2°C or below. The coldest month is January with an average low of 4°C and a record low of -4°C, so frost is rare and snow is very unlikely.

These records carry temperature and precipitation, not snowfall totals.

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 1,116 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 158 mm, roughly 4× the rainfall of the driest month (January).

Nagasaki climate: your questions

Does it snow in Nagasaki?

No: the coldest month in Nagasaki is January with an average low of 4°C and a record low of -4°C, so snow is very unlikely. What is falling now: Nagasaki weather today.

When is it going to snow in Nagasaki this month?

Nagasaki's winter months average lows of 5°C in December, 4°C in January and 5°C in February, with about 156 mm of precipitation across the three; 0 of them sit at or below 0°C, so snow is unlikely. The records hold no snowfall totals. The next 15 days: Nagasaki 10-day forecast.

Which months are best for visiting Nagasaki?

May and October to November are the most comfortable months in Nagasaki, with highs near 23°C. August is the warmest month, averaging 32°C by day; June is the wettest, with 158 mm; and January is the coolest, with lows near 4°C. What it is doing today: Nagasaki weather today.

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