Rainfall and ET0 are the two main factors in the tendency of floods or droughts in an area. Considering the impression capabilities of these two factors due to climate change, the aim of this study is to estimate rainfall and ET0 for future periods due to climate change and to evaluate their uncertainty with the potential for high flooding or drought. This research was conducted in the Singkoyo Watershed by conducting field surveys, daily rainfall data collection and climatology data. The analysis carried out in this study, namely: detection of climate change, projections of climate change and potential evapotranspiration. The conclusion of this study is: there has been a climate change in the Singkoyo watershed marked by Z ≠ 0 and occurred extreme monthly and annual rainfall. In general, it can be said that a decrease in potential evapotranspiration on one side will cause an increase in the average monthly rainfall on the other side. In the future it is likely that there will be a trend of increasing monthly and annual rainfall which is quite significant so we need to be aware of the danger of flooding. Therefore, it is necessary to implement climate change adaptation procedures.

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