Parents of children with autism experience significant stress and challenges in daily life that can impact their well-being. Using a daily diary method, the present study examined the same-day and next-day associations between child-related stress, social support, coping, and parental well-being outcomes (i.e. life satisfaction, positive and negative affect). A total of 76 parents (58 mothers) of autistic children participated in the study and completed daily diaries for 14 consecutive days. Multilevel modeling analyses indicated that child-related stress and social support were associated with same-day life satisfaction only in mothers. Moreover, positive coping on a given day was not only related to more positive affect and higher life satisfaction on the same day but also to higher life satisfaction on the next day, whereas negative coping was only related to higher negative affect and lower positive affect on the same day in both parents. These findings emphasize the benefits of positive coping and social support in raising children with autism, which may contribute toward the further development of existing support programs for parents of children with autism.