in summer time, Tokyo got Typhoon some times.
as you know, People who living in Tokyo Area, depends on Train or Bus. so if we get Typhoon, Train or Bus may stop for safety purpose. Even if 1 typhoon, we have a lot of economical loss. and of course we lost main frame to back home.
so if you can you should go home before train moving. hotels are fully book or close, you should not plan to use it.
if you come tokyo in summer time, Please check whether news.