On analysis of thirty five years rainfall data ( 1980-2015 ) of six stations of Andaman & Nicobar islands it was found through Mann-Kendall trend , Sen’s slope and Regression slope , that annual and monsoon rainfall at Mayabandar, LongIsland, PortBlair and Carnicobar showed increasing trend while that of HutBay and Nuncowrie showed decreasing trend. The monsoon season ( summer monsoon ) rainfall variability of 49.78% in Mayabandar, 52.12% in Long Island, 24.09 % in Port Blair, 49.39% in HutBay , 47.26% in Carnicobar and 51.91% in Nuncowrie has been recorded in this time span. The high coefficient of variation ( CV) denoted that the variability of rainfall is not equally distributed. A low standard deviation indicates that the data points tend to be close to the mean of the set, while a high standard deviation indicates that the data points are spread out over a wide range of values. High SD was reported at all the five stations of study in comparison to Port Blair which also had a low coefficient of variation. The rainfall distribution of different season viz. pre monsoon , monsoon , post monsoon and winter , it was observed that the highest present contribution of rainfall was observed during monsoon season followed by post monsoon in all the six stations of Andaman & Nicobar islands . Rainfall contribution during May to November was most in all the six stations studied , while in remaining months it was 5.3% in Mayabandar , 6.4% LongIsland, 10.2% in Port Blair, 12.3% in HutBay , 16.9% in CarNicobar and 21.1 % in Nuncowrie.