You will be sweaty when you get to the office, but you will find that its not a problem.

1. Keep a few changes of clean clothes at work.
2. Start off clean. Get a shower in the morning before you leave.
3. When you get to work, take a few minutes to cool down and stop sweating. Drinking ice water helps me.
4. Towel off, maybe rinse off in the sink if you need to.
5. Put on clean clothes.

I've been doing this for a couple years now and was surprised at how much a non-issue the whole getting sweaty thing is when you do it this way.