The weather in Nagasaki in August is very hot. The average temperatures are between 25°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.
Temperatures
30° / 25°
Rainy Days
11
Snowy Days
0
Dry Days
20
Rainfall
335
mm
Sun Hours
10.6
Hrs
