Recalling positive autobiographical memories (AMs) in everyday life has great potential to contribute to individual well-being. Few studies have examined naturally occurring positive AMs in everyday life. In a sample of healthy individuals (n = 70), we used ecological momentary assessment to (1) examine the content, characteristics, and information about the context and reactions of individuals to AMs occurring in everyday life, and (2) investigated whether the vividness of positive AMs is related to immediate AM-related happiness, assessed immediately after an AM was experienced. Our results showed that the content, characteristics (such as vividness and mental imagery), and processing of AMs varied considerably across daily life. While most AMs occurred out of nowhere, many participants were also aware of what triggered their AMs. A number of individuals shared their positive AMs with others and indicated savoring them. Furthermore, linear mixed effects models showed that AM vividness was positively associated with immediate AM-related happiness, both within and between individuals. Positive AM experiences hold promise for promoting positive emotions in everyday life. Our findings may inform prevention and intervention science aimed at integrating positive AM memories into individuals' daily lives.