Basalt fibres, naturally obtained from volcanic rocks have emerged as a promising reinforcement in the field of composite materials due to their excellent thermo-mechanical properties and environment-friendly applications. However, the strength of basalt fibre-reinforced polymer composite at elevated temperatures needs to be further researched. This research aims to investigate the behaviour of basalt fibres with a primary focus on Flexural Strength and Inter Laminar Shear Strength according to ASTM D790-10 and ASTM D2344 standards respectively at elevated temperatures. Symmetric laminates of Basalt epoxy composite and basalt epoxy composite with MWCNT as secondary reinforcement were made using autoclave fabrication methods followed by thermal conditioning at elevated temperatures. The results showed that interlaminar shear stress and flexural strength were improved after the introduction of MWCNT in the basalt epoxy composite. Introducing nano-fillers shows potential for improvement in the mechanical properties of basalt epoxy composites. These secondarily reinforced basalt epoxy composites due to their better mechanical properties at elevated temperatures can serve as a viable replacement for the more common glass fibre epoxy resin composites for specific applications and cost considerations.