Yup! it was pretty frustrating just finding a place to get a working API in the first place and then saw that DarkSky had one. They are the best for my area in the mountains of Colorado in forecasting, so it was nice to be able to use them. Now being forced to use OWM is a bummer. I am not sure how they are getting their data, it seems that they dont have as many stations up here so they are just guessing based on the few that they have which is obviously pretty inaccurate. A whole 10°F off this morning...
Start up an activity that uses GPS, get a lock, discard the activity and go back to the watch face. That should set the location for the watch face.