Is there anywhere that isn’t humid this time of year?

So I live in the Kansai area and had to swim to work in this humidity. It hits me like a brick every year, and seems to just be getting worse. Is it Kansai? Are there areas of Japan that are humid but maybe less humid? I've been told that "the mountains" aren't as humid, is this true? Are the coastal areas less miserable?

I'm seriously considering moving somewhere else (in Japan!) if the summers aren't as brutal.