The impact of ambient temperature on individuals' well-being is a critical concern in the context of global warming. Studying this impact not only helps draw personal relevance but also plays a vital role in raising public awareness, which is essential for effective mitigation efforts. This research examines the relationship between ambient temperature and the proportion of the population evaluating their lives as thriving, an aspect of well-being that has received limited attention in previous research. Employing a Bayesian approach to multi-level modeling, we investigate this connection between and within 163 regions over a span of 14 years (2006-2019). The between-region analysis partially supports the climato-economic theory, indicating that wealthier regions tend to have a higher proportion of thriving individuals in hot and cold climates, while less wealthy regions tend to have a lower proportion under the same climates. However, at the within-region level, we observe a general rise in temperature over the study period, which is associated with lower well-being. This within-region effect remains consistent regardless of economic development or regional climate, highlighting the universal negative impact of warming. The practical significance of these findings lies in their broad coverage of the world population and their focus on concrete measures of well-being, specifically the proportion of the thriving population. Furthermore, this research distinguishes between the effects of temperature on well-being between and within regions and underscores the pervasive influence of temperature rise in hindering well-being. These insights contribute to a deeper understanding of the extended implications of global warming on human society.