before I went clipless, I wore these closed toe sandle things from airwalk with my powergrip pedals. I'd spray the legs and feet down occasionally with the water bottle. I would also stop somewhere where I could take my wicking shirt off and soak it in water and wring it out. It actually got a bit chilly doing that sometimes.

I did 4-5 days a week for about 5 weeks and the temps averaged in the 100's. total love/hate.