This article explores the coupling between natural convection and surface radiation in a turbulent regime within a tall vertical enclosure. To emphasize this coupling, the <i>q(y)-T<sub>c</sub></i> configuration, previously studied in laminar flow, is reexamined with average Rayleigh numbers up to 10<sup>8</sup>. One vertical wall of the cavity is subjected to a linear heat flux, while the opposite wall is maintained isothermal at a uniform cold temperature. Using an efficient Reynolds-Averaged Navier-Stokes (RANS) model implemented in a finite volume-based computational code, the results reveal a significant increase in convective heat transfers at the expense of radiative heat transfers during the transition to the turbulent regime. In the fully turbulent state, the average dynamic field is straightforward, thermal stratification is highly pronounced, especially for positive slopes of the imposed heat flux, and local temperature profiles on the hot wall are roughly similar to those found in laminar flow.