BoM - Current Weather Observations for New South Wales http://www.bom.gov.au/products/IDN60900.shtml (Use this chart to forecast wind speeds on Pittwater and the Harbour. For instance compare wind speeds and direction from Norah Head , North Head and Sydney airport, this will give you a fair indication of what is going to happen in the next few hours.)
Check out the wind predictions and actuals used by windsurfers and sailors - scroll down to the synoptic 4 day charts to see the coming weather pattern. Change the page to today to get live wind reads.