WEATHER

Sydney Harbour is classified as Sydney Enclosed Waters.

You can download Sydney Weather Forecast Apps (for wind, wave/swell, tides, rain, UV level, sunrise, sunset)  to your phone. 

The most popular water-sports websites are: 

1. Bureau of Metrology (BOM). 

http://www.bom.gov.au/australia/meteye/?loc=NSW_MW004

The BOM app is excellent and can be downloaded to your phone.

The link has MetEye (Your eye on the environment). Type in Kurraba Pt or Seaforth and select 'detail'  for temperature, wind direction and knots, 

It gives forecasts at 3 hour intervals. 

http://www.bom.gov.au/nsw/forecasts/sydneywaters.shtml

2. Willy Weather 

https://wind.willyweather.com.au/nsw/sydney/fort-denison.html

It shows graphs of forecasts and real time for wind. The green and blue arrows show calm conditions. 

3. Seabreeze

www.seabreeze.com.au/weather/wind-forecast/sydney

Observations for Fort Denison:

It is good to be aware of the conditions you experienced, for this look at Sydney Latest Weather 

http://www.bom.gov.au/places/nsw/sydney/observations/fort-denison/

If forecasts are showing winds above 15 knots, then think twice about paddling out unless with a very experienced kayaker.​ Wind gusts can be 40 percent stronger than the average speeds presented on the map.