As others have noted, the 09 TSX has XM Weather. Is this something we can add to our 3G TL?

 

Is it any different from what we already get?

The standard XM traffic stations for each city (channels starting in the 200-series) also have the current weather in the city and a few close 'burbs in the permanent radio display along with the city name, and the lead-in to the traffic broadcasts also include a weather forecast.

 

Yes, it provides like a menu on the map were you can click and see the 1 and 3 day forcast. To the OP, you could, but it would be involved and would involve switching to the RL/TSX/MDX/RDX interface dial too. Basically you would need to put in a navi system from the TL or TSX since the drives sort out the info, and none of the XM weather drives sort out the info for touch-screen.