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Positive emotion has been shown to be associated with adaptive outcomes in a number of domains, including psychological health. However, research has largely focused on overall levels of positive emotion with less attention paid to how variable versus stable it is across time. We thus examined the psychological health correlates of positive emotion variability versus stability across 2 distinct studies, populations, and scientifically validated approaches for quantifying variability in emotion across time. Study 1 used a daily experience approach in a US community sample (N= 244) to examine positive emotion variability across 2 weeks (macrolevel). Study 2 adopted a daily reconstruction method in a French adult sample (N= 2,391) to examine variability within 1 day (microlevel). Greater macro-and microlevel variability in positive emotion was associated with worse psychological health, including lower well-being …