Yep. My weather disappeared yesterday and hasn't come back. It's not just the complication, but also the Weather app on the watch. The app doesn't show weather for any of the saved locations. As suggested above, I tried changing the complication to something else (Wallet, which worked fine), and back to Temperature. No joy. Just for kicks, I also tried Conditions and Rain. Still blank. Sunrise/Sunset is also blank. Several other complications that I tried work fine. Definitely a bug. And a rather annoying one.