my weather icons are dark again on my iPad Pro but its fine on my iPad Air 2. Deleting and adding the weather widget again does not help, it even shows them dark in the widget preview
Had same problem on my IP XS, tried deleting (ect) no joy. Reported it to apple but then a restart fixed it
but it came back a day later. Was going to do a clean install but the GM seems to have fixed it, fingers crossed.