If you would like to support it, as well as fund the 7Timer service behind it, you can get Xasteria Plus, which can access non-free weather sources and has some extra features like night vision mode, iPhone landscape view, lunar calendar, location manager.
The app has been extended to offer you quick access to all of your favourite weather resources and tools: Clear Sky Charts (for North American users), Clear Outside, Meteoblue, Windy, Astrospheric, Sat24.com, the latest water vapor satellite images and even light pollution maps.
The main forecast source, 7Timer, is based on the NOAA/NCEP-based numeric weather model, the Global Forecast System (GFS) and gives you a forecast for the entire globe with a resolution of about 20km at 3-hour intervals.
Xasteria provides you with a choice of 3 visualization modes for the data: the new 7Timer! ASTRO graphics, the color-stripe graphics similar to some other astro-forecast services and a raw text mode.
Xasteria was originally created to bring the excellent ASTRO weather forecast of the service 7Timer to your iOS device.
I would appreciate a quick review on the App Store if you are using the app (there will be no popup asking you in the app as I hate those).
Xasteria is available in English, Greek and French.
With worldwide coverage and one of the best performing astro-seeing models, it is a great tool for all stargazers.
Xasteria will always be ad-free.
If you would like to translate it to your own language, please contact the author.