Just added integration with the OpenWeatherMap API. The following commands have been added to Pie:

Weather (location)

Grabs the weather information for that specific location.

How is the weather

If you have defined your location, Pie will use that information to look up the weather in your city. If not, Pie will ask for your location.

City (location) - Chained

The user can set their home city with the command City. If no location is defined, Pie will ask for that location.

Country (location) - Chained

The user can set their home country with the command Country. If no location is defined, Pie will ask for that location.

Weather API:

http://openweathermap.org/api