Local weather forecasts appear on the radio (in German, of course). In the winter, snow reports can be found (we presume). You can phone for a forecast (also in German) or you can try the Tourist Office in Bad Aussee (no idea if they post a bulletin in the window - we don't seem to have tried). None of which we have numbers of URLs for. Fat lot of use then, eh ?
But for an up to the minute (maybe) idea of the weather right now, try the Loser WebCam - giving a current view of Loser from somewhere near the bottom of the skilifts.