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I like "Clear Outside" (clearoutside.com). There is also a good free mobile app for it.
yr.no is a Norwegian weather site that uses European weather satellites (that also cover Australia!), and gives good hour-by-hour cloud cover figures.
Accuweather.com has a view specifically for Astronomy, but only has an average figure of cloud cover for the night, and can be a bit hit and miss.
Weatherzone.com is also a site that has cloud cover figures for 3-hour slots.
In reality none of them are 100% accurate and I have had a couple of frustrating nights where is was supposed to completely clear and was in fact quite cloudy. As you know, conditions on the East Coast of Australia can change very quickly, so I guess it's a challenge.
You might also look at the Bureau of Meteorology's own web site (bom.gov.au) and look at the cloud radars. They have visible and IR views, which is handy for nighttime.
HTH,
John.
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