The following race location guides are available.

Race Location	Legal to ride outside of races?
Cobbler Creek	Yes
Craigburn Farm	Yes
Cromer	Yes
Eagle Park	Yes
Fox Creek	Yes
Flinders Uni	Yes, although see page for info
Kinchina (Rocky Gully)	Yes
Mt Crawford	Yes
Mt Torrens (Township)	No
Prospect Hill	Yes
Shepherds Hill	Yes

You may be interested in the Bureau of Meteorology’s latest feature, a clickable map allowing you to generate a weather forecast for a specific coordinate rather than just a local town. This is the most accurate forecast available other than going along and checking out the trails for yourself!
http://www.bom.gov.au/forecasts/graphical/public/sa/adelaide.php