Dark Sky (formerly known as Forecast.io):
- 1000 API calls free per day
- current weather including UV Index and Ozone
- minute-by-minute (max. 60 min), hour-by-hour (48 or 168 hours) and day-by-day (max. one week) forecasts
- weather alerts in the US, Canada, European Union member nations, and Israel
- 39 different languages (and the possibility to contribute more translations)
I am working on a binding 
, reached nearly 70% implementation progress until first beta version for testing could be published - hopefully in mid of December.