@oliverevans96
On Windy.com (not in the phone App) you can modify the colormaps as you like.
Go to Settings -> Modify layer colors
https://community.windy.com/topic/6455/colors/2
The modification will be applied to your phone App.
Here is a lot of examples of modified colors
https://community.windy.com/topic/7036/version-2-windy-customized-graphics