The error is

--8<---------------cut here---------------start------------->8---
> gapplication launch org.gnome.Weather
error sending Activate message to application: GDBus.Error:org.freedesktop.DBus.Error.Spawn.ChildExited: Process org.gnome.Weather exited with status 1
--8<---------------cut here---------------end--------------->8---

strace attached.

I've reported the issue upstream:

https://gitlab.gnome.org/GNOME/gnome-weather/-/issues/97

I've pushed a workaround in ea529c75d1e527ab76bf865d765bb529fcc2bb7d.

Also note that gnome-weather fails outside of GNOME (in my case with
EXWM) with

--8<---------------cut here---------------start------------->8---
> gnome-weather 
Unsatisfied dependency: GWeather
--8<---------------cut here---------------end--------------->8---

-- 
Pierre Neidhardt
https://ambrevar.xyz/