FISA has included a fantastic source of data on their world cup results website. For example for the recent Lucerne World Cup event, results can be viewed on this page. What’s even better, clicking on “GPS” reveals data on stroke frequency and average velocity on 50m intervals for each crew. For example, here. Finally, we can also find out the weight of each participant through his/her athlete’s page. For example, Ondrej Synek, world cup winner single sculls.
I watched all finals races as they were live broadcasted on Czech TV, so I know the weather was windstill and very very hot and sunny. The absence of wind makes these data ideal for comparison with a rowing model that does not take into account wind (although perhaps 5 m/s tailwind would have been even better), and the stroke frequency and crew weights are of course important input parameters.
The high temperature and strong sun will have had a negative influence on the athlete’s performance.