If you have a SmartWeather device which uses the same data source, you can pull the data off that device fairly easily.
…it’s not clear if the SmartWeather device will continue to exist after the Groovy shutdown though. It’s a cloud integration that uses the same TWC source, but the DTH itself is Groovy, so I’m not sure if they will handle it in a special way with the shutdown.
As an alternative, you can setup an Open Weather Map account and can query the data. It’s a few steps to get setup, but once you have the concept down, it provides a lot of functionality: