Real time water temp and windspeed data from Agincourt reef (on the outer reef just to the north of Port Douglas) can be found on the AIMS website here:
http://data.aims.gov.au/awsqaqc/do/station.do?stationId=1You'll notice that the air temp has been a few degrees lower than the water temp lately, due to the southerly component in the trades.
If you are a skinny fella like me, take the springsuit.

Andy