Working memory capacity (WMC) refers to the ability to maintain information in short–term memory while attending to the immediate environment, and has been associated with emotional states. Yet, research on the link between WMC and emotion in naturalistic settings is growing and inconsistencies have been observed. In the current study (N = 109), we directly replicated the procedures of a prior experience sampling study (Garrison & Schmeichel, 2022), which found that higher WMC attenuates the relationship between stressful events in daily (...) life and negative affect. We measured WMC in the laboratory and then measured the occurrence of stressful events, momentary emotional states, and coping responses to stress several times a day for six days. Higher WMC was associated with reduced momentary negative emotion, but this relationship did not depend on the occurrence of a stressful event. Exploratory analyses found that higher WMC was associated with a greater likelihood of planning as a coping response to stress and greater number of coping strategies reported per stressful event. However, coping did not mediate the link between WMC and momentary negative emotion. Our results contribute to the robustness and ecological validity of the link between WMC and reduced negative emotion in daily life. (shrink)