Composites materials are the emerging alternate materials rapidly being used in the engineering applications due to the specific advantages which include the ease of processing them to the required size and shape with minimal cost. However, the material behaviour when exposed to the moist environment is effected. In-view of this the present study aims at understanding the effect of moister on the mechanical behaviour of glass/epoxy composites. A considerable effect in the materials tensile and flexural behaviour is observed however there is no much change in the impact behaviour.