Rainfall is influenced by several things, one of which is sea surface temperature (SST). Previously, a study was carried out regarding the effect of sea surface temperature on rainfall in Bali waters and obtained negative correlation results or reversed direction. From this study, the initial hypothesis was obtained that the effect of sea surface temperature on rainfall in mainland Bali would be positive. This study aims to determine the effect of coastal sea surface temperature in Bali Province on rainfall on Bali Island by using data from 4 rain posts that are evenly distributed on Bali Island. In addition, this study also aims to prove the initial hypothesis used. From the research that has been done, the results show that the correlation of coastal sea surface temperature in Bali Province to rainfall on Bali Island is 0.7476. This figure shows a positive or unidirectional relationship which proves that the initial hypothesis is true. This means that the higher the sea surface temperature of the coast of Bali Province, the higher the rainfall on the island of Bali. Meanwhile, the effect of the coastal sea surface temperature of the Province of Bali on rainfall on the island of Bali is 55.9%. In addition, the distribution of sea surface temperature values and rainfall values in Bali is also obtained which tends to increase at the beginning and end of the year and tends to decrease in the middle of the year.