The Bureau of Meterology website is my first call. The satellite photos though tend to be a little low contrast so sometimes you get cloud that is not cumulus type that does not show up well in their images. So it appears that it should be clear yet it will be cloudy outside. But that is not that often. So the Skippy site or a local weather site which sometimes have very good satellite photos that show all cloud well is handy.
The radar is very useful as well to predict showers/storms that may be coming. I use that sometimes at my dark site where storms often go around my site and I can see distant lightning etc but its clear overhead. Its good to know what's happening and which way the weather is travelling and where the showers/storms are.
http://www.bom.gov.au/vic/?ref=hdr
Greg.