I have a personal weather station (PWS) and it integrates with weatherunderground. I use openHab 3 on a Raspberry Pi, and found the WeatherUnderground - Bindings | openHAB binding does not work, the weatherunderground:bridge has a state of COMMUNICATION_ERROR.
Instead I tried The Weather Company - Bindings | openHAB and configured the binding with the same [API Key|https://www.wunderground.com/member/api-keys] along with my PWM’s device ID from Loading | Weather Underground and added a channel for current temperature… and it works.
So if anyone is looking for a working binding to get info from their PWM in openhab 3.0, I can recomment The Weather Company - Bindings | openHAB