Click on a day for an hourly weather forecast
The weather in Nagasaki in August is very hot. The average temperatures are between 26°C and 30°C, drinking water regularly is advisable.
You can expect rain for roughly half of the month of August in Nagasaki. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Nagasaki in August 2025.
If you’re planning to visit Nagasaki in the near future, we highly recommend that you review the 14 day weather forecast for Nagasaki before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 10° / 7° | 9 | 20 | 3 | 113 mm | Awful | Nagasaki in January |
| February | 11° / 7° | 8 | 19 | 1 | 171 mm | Bad | Nagasaki in February |
| March | 14° / 10° | 7 | 23 | 0 | 199 mm | Ok | Nagasaki in March |
| April | 18° / 13° | 7 | 23 | 0 | 212 mm | Ok | Nagasaki in April |
| May | 22° / 17° | 7 | 24 | 0 | 245 mm | Ok | Nagasaki in May |
| June | 24° / 21° | 12 | 18 | 0 | 535 mm | Good | Nagasaki in June |
| July | 28° / 24° | 14 | 17 | 0 | 588 mm | Good | Nagasaki in July |
| August | 30° / 26° | 11 | 20 | 0 | 458 mm | Ok | Nagasaki in August |
| September | 27° / 23° | 10 | 20 | 0 | 313 mm | Good | Nagasaki in September |
| October | 23° / 19° | 5 | 26 | 0 | 172 mm | Perfect | Nagasaki in October |
| November | 18° / 14° | 6 | 24 | 0 | 170 mm | Good | Nagasaki in November |
| December | 12° / 9° | 8 | 23 | 1 | 162 mm | Bad | Nagasaki in December |