The stability of Earth's ecology and temperature is the main consequence of climate change. Climate change is one of the biggest problems around the world. The overall surface temperature has altered as a result of global warming due to an increase in greenhouse gas concentrations. It is directly affecting the environment. The ecology is influenced more to a greater extent when the global temperature rises. As a result, even with great effort, it is hard to turn the process around. The present study is mainly concerned with the changing trend of rainfall of a river basin of Amreli district, Gujarat, India. From the extensive literature review it can be established that the river is facing adverse effects of flood. This is an effort to analyse some of the most important climatic variables, precipitation and temperature for analyzing the trend in the study area. A statistical trend is an important change over time that may be identified using both parametric and non-parametric techniques, and trend analysis of a time series includes the size of the change. The Daily rainfall data of 40 years from 1979 to 2019 has been processed in the study to find out the monthly, seasonal and annual variability of precipitation and for this purpose a well established non-parametric test called Mann Kendall test has been used for the determination of trend. From the trend analysis it is found that the trend in precipitation ranges from −0.83 to 3.02 and for temperature it ranges from −3.27 to 3.09.