Cultural differences in the emphasis on positive and negative emotions suggest that the impact of these emotions on well-being may differ across cultural contexts. The present study utilised a momentary sampling method to capture average momentary emotional experiences. We found that for participants from cultural contexts that foster positive emotions, average momentary positive emotions predicted well-being better than average momentary negative emotions. In contrast, average momentary negative emotions were more strongly associated with well-being measures for Asian Americans, the group from (...) a cultural context that emphasises monitoring of negative emotions. Furthermore, we found that acculturation to American culture moderated the association between average momentary positive emotions and well-being for Asian Americans. These findings suggest the importance of culture in studying the impact of daily emotional experiences on well-being. (shrink)