Linking your SeeYou to the weather data from Top Meteo couldn't be easier. All you need to do is enter your Top Meteo username in SeeYou and that's it:

                                                                                                                                       


or open "My Waypoints and Tasks", turn on the Meteo overlay in View > Show > Meteo (or press the M button in the lower left corner of the SeeYou window):