Arguably the best forecasts for inland sailing is WillyWeather
Select "Canning Vale" or "Southern River" from the list of locations.
The closest location to our Canning Vale and Southern River venues for weather observations is Jandakot. These are shown on WillyWeather, and can also be viewed in detail at:
http://www.bom.gov.au/products/IDW60901/IDW60901.94609.shtml
if we are sailing on the South Perth foreshore, select Swan River-Mends Street jetty in WillyWeather. The closest wind observations are from Melville Water (Inner Dolphin):
http://www.bom.gov.au/products/IDW60901/IDW60901.95620.shtml
There are lots of other useful weather sites, just Google SeaBreeze, Meteye, Windy, BoM WA etc.