Water is life and every living thing depends on it for existence. Sachet water has gradually become the most widely consumed liquid in Nigeria with varying qualities. This study investigates the temporal variation in water quality of Sachet water produced in Ogbomoso, Oyo State. Ten (10) brands of sachet water from Ogbomoso South and North Local government area were collected within 24 hours of production and stored at standard room temperature and conditions. Sub-samples were drawn from the stock samples on daily basis for physico-chemical measurements on the water samples Temperature, pH, colour, turbidity, Hardness, Total Alkalinity, Dissolve Oxygen (DO), Biological Oxygen Demand (BOD), Electrical Conductivity (EC) and Nitrate values were determined in accordance with World Health Organization (W.H.O) analytical methods. Temperature, pH and Colour values ranged from (28.3 - 30.5) ̊C, (7.96 - 8.80) and (20-70) Hazen, respectively. The Total hardness EC and DO and BOD values varied from (45-105)mg/l, (11 - 184)µs, (2.83 - 12.24)mg/L and (18.2 - 28.4)mg/l, respectively. Shelf life for the selected sachet water in Ogbomoso is 12 weeks from the date of production under laboratory condition with partial exposure to sunlight.