With the introduction of the Tides app in watchOS 11, users can now view information about tides and swells along the coast. Is this data accessible to developers via WeatherKit?
In the Tides app, the data source for tides and weather is shown as WeatherKit.
There's no supported way for you to retrieve tide data with the APIs currently available. If you'd like us to consider adding the necessary functionality, please file an enhancement request using Feedback Assistant. Once you file the request, please post the FB number here.
If you're not familiar with how to file enhancement requests, take a look at Bug Reporting: How and Why?