Travel during typhoon season

I will be back in Japan in September, and this year I'll be traveling around Kyushu and to Yakushima to do some hiking. I know that typhoon season will be underway, and I'm wondering if I should be a bit more flexible with my plans, maybe even put off booking some flights and taking the train instead to avoid delays due to weather. I know that once when I was in Ishigaki and a typhoon was coming, I had to leave a day earlier to avoid being stuck on the island, and I can only assume that this could be the same problem I'll run into on the mainland as well, correct?

It is, of course, always a risk when you travel during that season, and impossible to predict. I don't think you really need to make alternate travel plans because it is so difficult to say if you'll really need to change anything or not.

And if a bad typhoon did approach, you're not going to have much more luck with trains than with planes anyway, so I say just book how you'd normally book, cross your fingers, and monitor the situation when the time comes. If it looks like a storm is heading your way, you can decide then. But you may be just fine.

Pacific typhoons can occur at any time of the year, but more commonly between July and October (so it is a bit unfair to single out a single month).

The point is that you still need to make your plans, and if there is a storm that coincides with your plans, then make the change.

Typically you will have three days of tracking and information available before a major storm reaches wherever you happen to be.