The article at hand focuses on the influence of wet-dry cycles on the mechanical properties and crack formation in strain-hardening cementitious composites (SHCC) made of limestone calcined clay cement (LC3) and high-performance polyethylene (PE) fibers. Specimens for uniaxial tension tests were produced with 2 vol.% fiber content and preloaded until 1% strain at the age of 28 days. Subsequently, the specimens were weekly exposed to three days of wetting and four days of drying cycles for 12 consequent weeks, followed by further tension tests, this time until ultimate failure. In addition, a series of preloaded specimens were kept under a controlled environment (20 ℃ and 65% RH) in a climate chamber and characterized as well. The mechanical properties of the two curing conditions were compared with each other, 28 days reference specimens, and the respected preloaded samples. The analysis of the mechanical properties showed a pronounced recovery in Young’s modulus, first crack stress, and tensile strength due to the wet-dry exposure. Furthermore, a detailed crack analysis via DIC analysis and optical microscopy revealed the crack closure phenomenon to some extent due to wet-dry cycles. The results indicate that strain-hardening limestone calcined clay cementitious composites (SHLC4) exhibit considerable mechanical performance and self-healing capacity.