Vocabulary What does 雷雨 (らいう, raiu) mean? 雷雨 (らいう, raiu) means thunderstorm; thundershower. Quick factsReadingらいうRomajiraiuPart of speechnoun 雷雨らいうraiuthunderstorm; thundershower1noun thunderstorm; thundershowerKanji in this word雷thunder雨rain