Nagasaki weather by month
2006-2025, 20 years of records · Not a forecast
Nagasaki is a port city climbing steep hillsides, so stairs and slopes get slippery in rain. June, in the rainy season, has the most wet days, and even winter has a fair number of grey or rainy ones. Typhoons can pass in August and September. The tram reaches most sights, but there are many climbs, so shoes with firm soles help. The night view from Mt. Inasa was named one of the World's New Three Great Night Views in 2012. Inns fill early around August 9 and the Kunchi festival on October 7 to 9.
On the record, May and October were the most forgiving months for visiting Nagasaki, judged on warmth and rain together. The wet and dry seasons were distinct: rain days bottomed out in October (6) and peaked in June (13).
Each month in a line
| January | crisp and chilly | 11° / 4° |
|---|---|---|
| February | chilly, frequent rain | 12° / 5° |
| March | crisp and chilly, frequent rain | 16° / 8° |
| April | cool, occasional rain | 20° / 12° |
| MayGood | comfortably warm, occasional rain | 24° / 16° |
| June | warm | 27° / 20° |
| July | properly hot | 31° / 25° |
| August | very hot | 32° / 26° |
| September | properly hot, frequent rain | 29° / 22° |
| OctoberGood | comfortably warm | 24° / 17° |
| November | cool | 19° / 11° |
| December | crisp and chilly, occasional rain | 13° / 6° |
The 12 months in numbers
The warmest month, August (32°C), and the coldest, January (11°C), were 21°C apart.
| Month | High | Low | Rain days | Rainfall | Humidity | Clear days |
|---|---|---|---|---|---|---|
| January | 11° | 4° | 8 days | 58mm | 66% | 4 days |
| February | 12° | 5° | 10 days | 98mm | 68% | 4 days |
| March | 16° | 8° | 9 days | 123mm | 71% | 6 days |
| April | 20° | 12° | 9 days | 143mm | 74% | 6 days |
| May | 24° | 16° | 9 days | 173mm | 80% | 6 days |
| June | 27° | 20° | 13 days | 333mm | 87% | 2 days |
| July | 31° | 25° | 11 days | 292mm | 88% | 5 days |
| August | 32° | 26° | 11 days | 274mm | 83% | 8 days |
| September | 29° | 22° | 10 days | 176mm | 79% | 7 days |
| October | 24° | 17° | 6 days | 91mm | 71% | 12 days |
| November | 19° | 11° | 8 days | 98mm | 69% | 7 days |
| December | 13° | 6° | 9 days | 74mm | 67% | 4 days |
Enter your dates to see how that stretch went in each of the past 20 years.
Common questions
When is the best time to visit Nagasaki?
On the record, May and October were the most forgiving months for visiting Nagasaki, judged on warmth and rain together. The wet and dry seasons were distinct: rain days bottomed out in October (6) and peaked in June (13).
Which month is driest in Nagasaki?
October. Over 2006-2025 it averaged 6 rain days and 91 mm of rain.
Which month is warmest in Nagasaki?
August, with highs averaging 32°C and lows 26°C. The warmest month, August (32°C), and the coldest, January (11°C), were 21°C apart.