This article aims to review and investigate the relationship between the weather and precipitation on the rice farming of Thailand. The change of weather directly affected to the amount of precipitation in Thailand. The unbalance of
precipitation and the change in period of time directly affected to the rice farming. The meteorological data from 1970 to 2000 showed that the tendency of weather change in Thailand corresponded to the global warming and the world
climate change in the present day. This tendency affected to the amount of precipitation and might affected to the period of farming and harvest season.