Great graphical representation of the forecast at seabreeze.com.au
Start your search for smaller waves at the south end of a Sydney beach (except Bondi), find somewhere out of the wind. Remember that overcast and cold weather should keeps the crowds away.
Heavy rain can be a health problem.
For places you may not have thought about see the Sydney Beach Map: maps.google.com/maps
View Sydney Surf for beginners in a larger map
A rough guide to the various web sites of Bruce White