Will Thailand still get a tan after dark?

yes. There are also ultraviolet rays in Thailand when it is dark. During the period after 1 o'clock at night and in the early morning, due to the refraction of sunlight by the atmosphere, a small amount of ultraviolet rays are still scattered in the air at night. If you go out in the dark and are exposed to these small amounts of ultraviolet rays, it will still cause melanin precipitation in the basal layer of the skin and cause the skin to turn black. You should also pay attention to prevent ultraviolet rays from invading when you go out in the dark. So Thailand will get a tan after dark.