Hi, it is said that Seltember is typhoon season, but typhoons come to Japan during summer, not only in September. This year, in July, some typhoons came and now other one is coming. Sometimes they affect much but sometimes they don't so much, all depends on each typhoon. However, I think there are so many types of danger in Japan, I mean, all over the world. Japan is one of the countries where earthquakes occar very often but we live here. I hope this helps for your desidion to come to Japan or not. It's your trip of your life, all is up to you. Best.