OK... so I watched race 8. There was fog so obviously there wasn't much wind about. I missed the wind speed but there was not a hint of white caps, looked to me to be around 10 knots. Also there was a tug/fire boat at the end shooting up a huge stream of water, again looked like poor conditions.
edit: from the official blog "With the windspeed up to 12 to 13 knots,"
Team New Zealand hit 41 knots as they crossed the finish line.

Check out the last leg from 18:30 into the video...