Following an update to 2023.3.1, I was forced to roll my install back to 2023.2.x and everything started working again. I saw 2023.3.2 was released, so I upgraded thinking the issue may have been fixed. It broke again. 
Anyone else having the same issue?
Did you check the release notes topic?
https://community.home-assistant.io/t/2023-3-dialogs/541999
Also a search turned up this: Wunderground Weather and Home Assistant - #46 by fugley
yep - same issue here
seems to happen regularly that the first few updates to HA break Weather Underground integration
both updates tested - both break WU.
That’s why I never update to a .1, .2 or .3 version of a monthly release but wait until the introduced bugs get fixed first.
Version .4 usually is mature enough for production deployment.