I favor Forecast.io for weather. They've since renamed themselves to Darksky.net but ... I prefer the forecast name and still have in my bookmarks from years back. It's a damn good weather service w/dandy mobile apps. I don't use Apple products but know a couple folks who use their iPhone app and give it good marks. Heh, I don't use an Android anymore either so cannot speak to that side but suspect it's pretty darn good as well.
Okay, enough promo and onto the subject at hand: One thing that set them apart early on was the absence of b.s. ads and the presence of excellent mapping that you could select/tune for different parameters of interest, e.g. wind speed. Here's a blog post where they talk about it some.
All that eye candy aside, I find them to be far more accurate than the competition, e.g. weather.com and accurateweather.com, which tend to monetize by acting as portals to click bait stuff I don't care to be bombarded with when I just want to check the weather. Also, not financially incentivized to "massage" the data so as to keep me checking back every ten minutes for updates. Toby recommended.