I like yr - they have a really great UI. Pretty sweet example of what proper government funded agencies can achieve. The forecast is only OK in areas that aren't Norway, Sweden or Denmark though. It's about on par with what I get from the default iOS app though, so I end up using yr anyway.
I’ve used yr the past few years, too (learning about it from HN). Glad to hear that the forecasts compare to the stock weather app, since that’s something I’m always wondering but I’ve never tried anything else.