So instead of pulling from Weewx, which would be used for station data right from your own PWS, this pulls WU data, but they don't let you pull data into an app for free. You have to either be a paying customer, or your PWS needs to be a contributor of weather data in order to get the API key needed to pull data into an application without charge.
Most weather stations upload to WU. As long as you are doing that, you can apparently get a new API key. I've had my account for many years, so I cannot tell you what this looks like for a new user. However here's how I just did it seconds ago.
- Log in to WU
- Click the Gear icon (top right) and choose "More Settings"
- Click the far right tab that says "API Keys"
- Click "Generate Key" and then "Copy to Clipboard" so you can paste it into the app.
