I also posted this in the Samsung BeNeLux community.
It seems after the update to One UI 2.1, the Weather / Clock widget no longer displays the temperature on my Lock Screen. (I'm using the Samsung Clear View cover.)
I've updated all the apps in Galaxy Store and made sure all Notifications were enabled for this app.
I'm not necessarily expecting a solution here, but perhaps this could be forwarded and looked at.
I really liked seeing the outside temperature on my Lock Screen, it was a great feature and it's too bad it's now missing.
I should also add that I removed the widget and reinstalled it. That made no difference.
Thanks, Dave Horne
An update for Weather in the Galaxy Store solved this issue.
Just passin' this on.
All the best, Dave Horne