A study was conducted to understand the acidic nature of hypersaline groundwater in coastal aquifers of Kuwait. A few hypersaline (HS) and hypersaline acidic groundwater (HSAG) were identified from the samples collected along the Kuwait shoreline. The samples with electrical conductivity (EC) lesser than the HS samples were considered saline to brackish (SLB). This study focuses mainly on the geochemistry of hypersaline, especially hypersaline acidic groundwater to determine their ion associations, sources, and their thermodynamic saturation states. H2S was detected only in the HSAG samples and were of Na-Cl type. The ion ratios of Na/Cl, SO4/Cl, B/Cl, Br/Cl, Ca/Mg, Mg/Cl, Li/Br, and Ca/(SO4 + HCO3) reflect different trends for HS, HSAG, and SLB groundwater samples. It is interesting to note that the HSAG samples were represented in two different clusters. Saturation indices calculated for the carbonate and the sulfate minerals indicate that the carbonate minerals (calcite, aragonite, dolomite, magnesite) are under-saturated in the acidic environment. The sulfate minerals (anhydrite and gypsum) reflect saturation to near saturation state in the HSAG samples. Iron (Fe) oxidation and reduction trend was correlated with the pH of the samples by calculating the Fe(OH)2+, Fe(OH)3, Fe(OH)4−, Fe2(OH)24+, and Fe3(OH)45+ species . These species of Fe were calculated by using by PHREEQC and it shows that Fe(OH)2+ is the more predominant form of Fe followed by Fe(OH)3. The PCA analysis identified four different factors for HS and HSAG samples of which the HSAG samples were represented by two different factors. One cluster reflects the geochemical interaction of deeper groundwater with lithology and the other shows association with nitrate reflecting the influence of anthropogenic source. Hence, two major factors were identified to be responsible for the acidic nature of HS groundwater, natural geochemical reactions with the host matrix, and the influence of the anthropogenic influx in the bay.