I don’t use the default weather modules but I loaded up the weather forecast module and it errors, stating:
Failed to load resource: the server responded with a status of 401 (Unauthorized)
weatherforecast.js:261 weatherforecast: Your AppID does not support long term forecasts.
So, it looks like the appKey from open weather is the problem, or, the module is asking for data that is not available to holders of the free api.
Run your mirror by using npm start dev
and see if that is the error you are getting