They should be working, but my quick test could not get them to appear. I’ll get looked into, thanks for reporting.
I did a quick blog on getting rain over on our website, see if that helps at all - https://simul.co/real-time-rendering-news/precipitation-and-storms-/
As far as we can tell, we have the issues fixed in the office. The next update should be Friday, so try testing it then. Apologies for the delays