I'm a clyde commuter here in Tampa Bay. I HATE our summer weather (though February is pretty F...ing nice!), so I have carefully considered my summer commuting outfit. I wear a polyester workout top similar to the C9's though I got mine at Walmart (Target doesn't carry my size usually). I wear Lycra bib shorts from Aerotech, and I wear closed toe sandals. The kind that are sort of a hybrid between walking shoes and sandals.

As a side note, I use my iPhone to keep track of mileage. A few weeks ago before it got really hot like it is now I was trying to convince myself that it wasn't that bad (riding home from class at 1pm), when my phone informed me that it was going to shut down because it was overheating!. Its not so bad here until about 11, but by about 12:30 until 6 it just isn't fun.