But it takes a bit more thinking and interaction to understand how the weather develops. For example, I like to see how the temperature changes during the day and for that, I find a graph illustrates the hourly changes better than just numbers and colors, but the information is obviously available here too. Just requires but more thinking from the user.

Are you thinking adding other things like humidity and wind? If so, would you try to fit more information to the dial or add some popups or something else?