@Green-Bean
Right there is no way to customize the color scale on the App. You have to do it on the website www.windy.com, on desktop/laptop.
On iPad it is possible if you use your browser with www.windy.com
See screenshot of my iPad with color scale settings page
[image: 1581322931609-6d113bb4-f637-457c-a803-ff678f6e45f6.jpeg]