One possibility is to emulate web browser and pull the HTML code from their sources, such as m.weather.com. This would be similar to playon LUA scripts that loads the web pages acting like browser and then extracts the necessary information from the HTML code using search strings looking specific keywords. I have done couple playon LUA scripts (One of them as an example is "All iLive channels" at http://www.playonscripts.com/).

The downside for the above method is that it may have large overhead of unnecessary data (packet data users may be concerned) due to loading everything what exists in real web page. Second issue is that if the providers keep changing the HTML web site layout it normally breaks these scripts.