There is a company called Reef Referral that does something like this, wonder how they get around the app review process.

Both api and Apple's Weather app look down for me.

The issue still persist. Current failure rate: Error rate:  37.0 %

I used the one in Swift docs, seem to match (but it's not guaranteed I guess)

I have also noticed that this will happen when using Swift's URLRequests, but does not happen when calling the endpoints from Python using requests library.

I have noticed that this happens only on when I'm on my local network, but it works fine when connected through a vpn. Could it be an issue with a network configuration of the WeatherKit REST API servers?

This error is showing up in around 10% of our calls

Same thing, happening on some of the requests. They are also very slow, up to 30 seconds.