AbstractWeyl semimetals (WSMs) with high electrical conductivity and suitable carrier density near the Fermi level are enticing candidates for aqueous Zn‐ion batteries (AZIBs), meriting from topological surface states (TSSs). We propose a WSM Co₃Sn₂S₂ cathode for AZIBs showing a discharge plateau around 1.5 V. By introducing Sn vacancies, extra redox peaks from the Sn⁴⁺/Sn²⁺ transition appear, which leads to more Zn²⁺ transfer channels and active sites promoting charge‐storage kinetics and Zn²⁺ storage capability. Co₃Sn_1.8S₂ achieves a specific energy of 305 Wh kg⁻¹ (0.2 Ag⁻¹) and a specific power of 4900 Wkg⁻¹ (5 Ag⁻¹). Co₃Sn_1.8S₂ and Zn_xCo₃Sn_1.8S₂ benefit from better conductivity at lower temperatures; the quasi‐solid Co₃Sn_1.8S₂//Zn battery delivers 126 mAh g⁻¹ (0.6 Ag⁻¹) at −30 °C and a cycling stability over 3000 cycles (2 Ag⁻¹) with 85 % capacity retention at −10 °C.