Updated: July 19, 2018
Following record rainfall in the western part of Japan, details of The heavy Rain Event of July 2018 can be found on Japan Meteorological Agency 
website.
Please check the latest information on each transportation website.
Airport
To/From Hiroshima, temporary buses are available between Hiroshima Airport and Higashi Hiroshima station until train/bus normal operations can be resumed. Other airports are mostly operating as usual, though there are some flight delays and cancellations due to the heavy rain. Further information is available on following websites.
Fukuoka Airport
Hiroshima Airport
Kansai International Airport
Osaka International Airport (Itami)
Kobe Airport
Chubu Centrair International Airport
Tokyo International Airport (Haneda)
Narita International Airport
Trains
Sanyo and Tokaido Shinkansen, and the trains in Kansai (including limited express Haruka), Hokuriku area are operated as usual. However, there are cancellations, delays and suspensions on some routes especially Chugoku and Shikoku area. Details can be found on following websites.
There are cancellations, delays and suspensions on these private railways.
Nagara River Railway Company （Gifu, Select a language from the language list on top of the page)
Kyoto Tango Railway (Only in Japanese)
Ibara Railway Company (Okayama, Only in Japanese)
Nishikigawa Tetudou (Yamaguchi, Only in Japanese)
Heisei Chikuho Railway (Fukuoka, Only in Japanese)
$GOOGLE::10rBS3utNunXVPa2zEi_-WGyvFVq2GGJH
Highway
Some highways, such as Sanyo Expressway, Chugoku Express way, Kochi Expressway, Kyushu Expressway and Higashi Kyushu Expressway are closed due to the downpour. Select “SEARCH AREA” from the below website and check your availability.
Free WiFi Service for emergency
SSID "00000JAPAN" is available in Okayama Prefecture, Hiroshima Prefecture and Ehime Prefecture.
Free public Wi-Fi service with SSID "00000JAPAN", available only in case of disasters, is now provided in the whole area in Okayama Prefecture, Hiroshima Prefecture and Ehime Prefecture since July 7th. Internet access is now available for anyone by connecting wireless LAN through this SSID without any contract with telecommunication careers in Japan. With any Wi-Fi available devices such as smartphones, tablets or PCs, everyone can receive wireless LAN service by choosing the network "00000JAPAN" on au Wi-Fi SPOT, docomo Wi-Fi spots (except some parts), and Softbank Wi-Fi spots.
*Free Wi-Fi service has been discontinued after Aug 2.
Safety tips for travelers
Japan Tourism Agency's "Safety tips for travelers" contains links to other sites controlled by third-party information providers on weather information, weather warning & advisories, news, medical information, and list of embassies and consulates-generals in Japan.
https://www.jnto.go.jp/safety-tips/eng/
For safe travels in Japan
Japan Tourism Agency's "Guide for when you are feeling ill ” provides medical institutions information, search function, and guideline. The website is available in English, Chinese, and Korean.
Further queries may be directed to JNTO Tourist Information Center (TIC) at 03-3201-3331 (or +81-3-3201-3331 from outside Japan) available 24/7 in English, Chinese, Korean and Japanese languages.
