It only works for Germany I believe, but the best app (both for the actual forecasts and the nice widget) is the Deutsche Wetterdienst app - though thanks to legal shenanigans you have to pay a euro for it.
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windy.com is what use for radar. (There's an app for it too.)
Windy is it. Great initial view of favorites for the quick check and beautiful visualizations, but man does it get deep if you want to double click.
For instance, a few weeks back I wanted to see why the sun looked orange and the sky was pale at ~3pm, so I pulled up the particulates map. I could see a 6hr moving map of particulates making their way from Alberta CA over to the skies to my west.
Also, they show a breakdown of all the major weather service providers' forecasts and detail which are better in which situations, helping you understand if that forecast you're planning on is really going to happen or it's just wishful thinking.
Oh, and you can set up alerts to notify you days ahead of time if conditions are right for activities, like if it's cool enough and good enough air quality to go for a run or if the wave swells will be high for surfing or what have you.
Honestly, my go to has to be Weather Today. Great layout with support for Apple Weatherkit (dark sky api).
https://play.google.com/store/apps/details?id=com.kokoschka.michael.weather
I'm a fan of the very light, widget-only AF Weather. All it does is a chart showing temp & precipitation for the next 24hrs. I like it more than "hourly" forecasts in other apps, but it is pretty niche.
How many weather data providers are there in most country?
Almost all weather apps and channels in the US get their raw data from a single government agency called the NOAA. But all of those entities interpret that data and present it to the end user differently. So I can't say how many the average country has, but the US doesn't really have as many as it seems.
Flowx shows the model is using and you can change it.
This is a great weather app. I can vouch for that. I've been using it for a little while now and I really like the layout.
I'm using Today Weather. Great overall app in terms of UI and info.
I use weather apps every day. My job revolves around the weather. I currently live in NW Indiana and the weather here is notoriously fickle. I need good forecasts.
Over the years, AccuWeather has been the most accurate and user-friendly by MILES.
Personally the BBC Weather app has always been my favourite although the default Samsung one has gotten really good, too.
I'm actually developing a weather app for Android. Its still in its early phases and is lacking in features, but if you search for Weather Warbler on the play store, you will find it. It's in beta and you can expect some bugs here and there, but trying to build a fun weather app.
International: Weather&Radar - best overall UK: Wearher Forcast UK or MetOffice app (same source but different UI) GER: Deutscher Wetterdienst und Regen Vorschau (very accurate but only GER)
I highly recommend Foreca Weather. They have recently decided to put a ton of work into the app and for the past few months it's been getting updated weekly with a bunch of new features. I love that kind of shit.
Pretty neat, installed it from their GitHub. What change I was really hoping for from Geometric Weather was better widgets and to have the widgets include material you colors. Seems like they're largely unchanged right now.
Weawow by far.
eWeather HDF
I've started using Forescaster, it uses the weather api from apple which is a bit meh, but the way it shows the weather is great.
I have to follow rainfall amounts for work and I use Weather Underground for the hourly precipitation estimate and 10 day look ahead. I still use Weather channel for the radar but I'm going to check out some of these to look for a better one