The main goal of this research is to investigate how hygroscopic performance influences chemically glued composite materials, which were manufactured using both hand layup and vacuum bag techniques. The study involved employing numerical techniques to measure density and conducting a hygroscopic test following the ASTM D570 standard, all with the aim of identifying the most promising composite candidates. The results unveiled that the L3 and L4 laminated composites, composed of hemp-carbon and hemp-aramid combinations, demonstrated the lowest density and water absorption percentage compared to other composites. This favourable outcome was attributed to the reduced number of voids resulting from the vacuum production process. These principal findings indicate the potential for improved mechanical properties in these materials. The study's findings are of great value to designers and engineers, providing crucial insights and data for evaluating the material's stability and making necessary adjustments in the design or manufacturing process. Understanding the hygroscopic behaviour and its impact on composite materials is crucial for ensuring their long-term performance and durability.