We've had freak summer thunderstorms, getting us +90º and +70% humidity. It's horrible. I don't think the sweating is any worse, it just doesn't evaporate, so by the time a 2-hour ride is over, I feel gross... and sticky. Usually this time of year we're in single-digit humidity. I'll drink four bottles in 2 hours, sweat out 10lbs of water, and the jersey will be mostly dry when getting home.