iOS 15 - interesting, assumed they’d only be attributing data they were actually using!
Apple’s forecast does vary slightly from the ones the BBC (using MeteoGroup) and the Met Office give, so I’m not sure what their source is if it’s not the weather channel.
They use Dark Sky for some data points, even on iOS 15. But I believe the 10 day forecast is from the Weather Channel (which, to clarify, means weather.com)
I wonder too, they get the rain forecasts wrong all the time. They are at least off by 1-2 hours or somtimed forecast rain when there is none. Compare that to other apps like WeatherPro which are way closer
That's also what I'm using (WeatherPro). But sadly it's on the decline and seems to have been abandoned since the data supplier was acquired by another company. I only heard rumours though.