A pot culture experiment was conducted in a Carbon dioxide and Temperature Gradient Chamber (CTGC) at ICAR-CRIDA, Hyderabad, during two consecutive kharif seasons (2022-23 and 2023-24) to study the influence of elevated temperature (eT), elevated CO₂ (eCO₂), herbicide dosages and crop-weed interactions on Specific Leaf Area (SLA), Relative Growth Rate (RGR) and Net Assimilation Rate (NAR) of groundnut (Arachis hypogaea L.) cv. K-6. Elevated temperature (eT) recorded the highest SLA (289.5 cm²/g) but the lowest RGR (0.415 g/g/day), indicating heat-induced leaf expansion concurrent with growth limitation. Elevated CO₂ (eCO₂) alone yielded the lowest SLA (217.8 cm²/g) but a higher RGR (0.468 g/g/day), reflecting more efficient dry matter accumulation per unit leaf area. The combined eT+eCO₂ treatment registered the highest RGR (0.474 g/g/day), confirming that elevated CO₂ partially ameliorated heat-induced growth limitation. Net Assimilation Rate was highest under ambient conditions (9.98 g/m²/day), declining progressively under all elevated treatments. The 1.5X dose of Imazethapyr + Propaquizafop recorded the most favourable RGR (0.483 g/g/day) and late-season NAR (2.01 g/m²/day) without significantly influencing SLA. Among crop-weed combinations, G+C4 recorded the highest SLA (274.8 cm²/g), while G+C3 & C4 exhibited the highest NAR (8.94 g/m²/day). C4 weed species were less competitive than C3 weeds for growth resources, thereby imposing lesser constraint on groundnut growth and carbon assimilation.