yup

I live in New Mexico - I don't get the humidity you do but the summers here can be over 100 degrees. Couple of things you could do: go to your LBS and talk to them about biking alternatives to your job - there may be bike routes and/or trails between you and the office that they would know about....or even a map put out by one of the local biking coalitions with marked trails on it. or

get in your car on the weekends or at night coming home and look for different routes home that will get you to point B from point A. If I remember right, don't most of your interstates have secondary roads or parallel roads that you can use?

as for the sweat - tell me about it....on my lunch rides in the summer I sweat so much my waistband doesn't always get dried before I have to commute home - great, wet sweaty bikie clothes for my evening commute! lol but Anyway - I keep WetOnes at work or something like that are hypoallergenic. I use them like a washcloth and wipe up pretty much everything. I also keep deodorant, a hairbrush (hair down past my waist), and a towel at work. On the days my hair is dripping wet I'll use a WetOne to wipe my hair down, towel dry and brush it out. I don't have a shower at my office.

I'm lucky in that I"m the only woman in my office so I have hooks in the ladies bathroom that I hang all my bikie clothes on. If you're not that lucky - one of the ladies here on the board says they know of a woman that lays her bikie stuff under her desk to dry out between rides.

I also use a backpack and a trunck rack (in the winter) to carry my clothes, lunch whatever back and forth but I think V uses panniers for her schoolstuff so one or both options may work for you.

It'll take some planning in the early stages and it may take a couple of rides to work out all the kinks but (whining aside) I wouldn't trade my bike commute for anything: it's the best way to start my day and like someone here said, the ride home at night leaves you ready to face whatever your evening has in store for you! and in the summer when the days are longer - it could potentially take you twice as long to get home in the evenings coz - ya know - just add on a few more miles here and there!