The temperatures in Nagano in August are comfortable with low of 14°C and and high up to 28°C.
You can expect rain for roughly half of the month of August in Nagano. 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 Nagano in August 2025.
If you’re planning to visit Nagano in the near future, we highly recommend that you review the 14 day weather forecast for Nagano before you arrive.
Temperatures
28° / 14°
Rainy Days
13
Snowy Days
0
Dry Days
18
Rainfall
292
mm
Sun Hours
10.9
Hrs
