[ysnp]

> but won't work since most require you to have Google Play services enabled which Graphene sandboxes by default:

I might be understanding this wrong, but note that GrapheneOS providing Google Play services as regular sandboxed apps should not have anything to do with whether an app requires play services.

So, if you want to use an app that does require them, you would need to install the sandboxed-play-services from GrapheneOS's Apps store then install the (Weather) app you need. GrapheneOS doesn't preinstall any Google (stuff by default), so there is an extra step.