I switched out tires on the Atlantis just to see how it rides with 2.1 knobbies as oppsed to the 1.5 simi slick. Although I did this last night I still left home around 8:00 AM. Temps were perfect low 60's, but humidty was up to 100% so my goal is just to ride slow. I reached my goald and slowly made my way to work, total commute time came in around 13 minutes.
The thing about the humidity is that it just sucks the sweat out of the body, it doesn't matter how easy things are taken. As I don't have a shower at the office I think I may carry a small container of baby powder.