This article presents the weathering behavior of glass-fiber reinforced polyester sheets exposed to different climatic conditions for ten years. Weathering behavior of laminates with A type glass fiber has been found to be inferior to that of laminates with E type glass fiber under hot, humid conditions. The laminates with gel coat treatment show minimal weathering failure in ten years of exposure compared to other laminates with a relatively resin-poor surface. While solar radiation is the primary cause of photodegradation, the extent of degradation is governed by the temperature and humidity.