In this report, we present the precipitation data that had been obtained in Japan since 1890. The long-term tendency of precipitation indicates that the annual precipitation in Japan is decreasing. However, extreme rainfall events (such as ≥50 and 100 mm/h) showed an increasing tendency, probably due to climate change. The statistical data of sediment-related disaster due to precipitation also showed a tendency for slight yearly increase. Some catastrophic landslides related to extreme weather condition in recent years in Japan were also introduced as examples. Finally, we analyzed the flooding occurrence of Kamo River in Kyoto City, where long-term records are available. The results indicate that the frequency of flooding of the Kamo River is not related with the climate change, and the effect of human activity on nature is more serious than the natural processes.