This study evaluates the impact of aging on the solar reflectance of four façade paints after two years of natural aging in three Brazilian cities, as well as after accelerated aging based on ASTM D7897 standard. Solar reflectance (ρ) was measured for freshly painted samples and after the aging processes. The results found show that solar reflectance, with some exceptions, tends to decrease after surface degradation resulting from natural and accelerated aging processes. Notably, the blue samples exhibited the largest variation in solar reflectance (Δρ 0.064). Among the colors that experienced a decline, the white paint showed the most significant decrease (Δρ − 0.053). For the accelerated aging tests, the variations in solar reflectance were similar across all four colors, though the blue samples experienced a more pronounced reduction (− 0.038). Overall, the impact of accelerated aging was significantly smaller than that of natural aging. Additionally, there were notable differences in how the blue and red samples responded to each aging method. While blue samples showed an increase in ρ after natural aging, they showed a decrease after accelerated aging. In contrast, red samples exhibited a decrease in ρ after natural aging but an increase after accelerated aging. Furthermore, the effects of UV radiation were found to be more significant after exposure to weather conditions. The accelerated aging method tested proved ineffective in simulating paint aging under these conditions, particularly with regard to solar reflectance and compatibility with various Brazilian climates. Further studies are necessary to assess the compatibility of the effects experienced during these two aging processes.