In the material graph there is a group of nodes dedicated to the new sky atmosphere system, one of them is Distant Light Scattered Luminance which seems to provide a good average color of the sky.
Is there any way to access this from blueprint so that I can update the color of a stationary skylight at runtime?
I had this idea myself, but I haven’t tested it yet. This can be done like this: You can use node Draw Material To Render Target. Use the resulting texture in BP. It will be good if someone then writes back about the results.