The temperatures in Karuizawa in August are comfortable with low of 16°C and and high up to 26°C.
You can expect rain for roughly half of the month of August in Karuizawa. 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 Karuizawa in August 2025.
If you’re planning to visit Karuizawa in the near future, we highly recommend that you review the 14 day weather forecast for Karuizawa before you arrive.
Temperatures
26° / 16°
Rainy Days
10
Snowy Days
0
Dry Days
21
Rainfall
241
mm
Sun Hours
4.6
Hrs
