www.bom.gov.au/nsw/forecasts/sydneycoast.shtml
Forecast for Thursday until midnight
Winds: East to northeasterly 25 to 30 knots increasing to 25 to 40 knots in the afternoon.
Seas: 2 to 3 metres increasing to 4 metres around midday.
Swell:Easterly 2 to 3 metres.
Weather:The chance of thunderstorms. Large swells breaking dangerously close inshore.
www.seabreeze.com.au/graphs/nsw.asp
kitesurfing.com.au/
And don't forget to check this one...
www.bom.gov.au/products/IDR714.loop.shtml#skip