It's not updating on my Vivoactive HR either. I'm sure it happened after the last GC update.
Some times after restarting my phone it will update but then stops again.
Apologies for the delay in response over the weekend. We are actively looking into the weather widget issues and will post an update once we have a resolution.
How do you get through for help besides waiting on the phone ??
Chat, email, tweet @Garmin