One thing I did when I commuted in a similar situation about 10 years ago was take a week's wardrobe to the office on the weekend and leave it there. Just hung up a garment bag on the back of my door, no one ever noticed or asked. That way when I biked in M-F I didn't have to worry about bring clothes with me. And then on Friday I just stuffed all the clothes from the week into a bag and took them to the cleaners. You need to have 2 weeks worth of clothes to do this.

My (obvious) trick is just to ride super slow. I can do this is Chicago as it's flat - I couldn't do this when I lived in Sydney as I had over 1k of climbing to the office on the route I liked, so it didn't matter how slow I went! I have to make sure the wind isn't blowing to hard from the south, and that the temperature is under 75. Then I'm fresh as a daisy. The 15kms can take 45mins instead of under 35 though - but the lakes nice.

It's usually pretty darn cool by the lake even on hot days.

And I second the bring clothes to work thing. I typically being a weeks worth of clothes to the office on tuesdays; I need to drive quite a bit out of the way to drop my daughter off anyway.

This is my pattern and, from my experience, the most difficult part is bringing your clothes to work without them getting terribly wrinkly--unless your using a car like BVT. I finally found a locker that I can use, so it fits 4-5 shirts that I loosely fold in my pannier. Lots of garment bags are available in pannier styles, so that would very pretty helpful. Since you're dressing pretty formally, it may be worth to see if a dry cleaner delivers. It's a pretty common service in the US.

Try rolling your clothes instead of folding it. Far less wrinkles that way. You can also use a fabric steamer to unwrinkle your clothes. I don't bother ironing my dress shirts anymore. I simply steam away the wrinkles when I get to work :) Takes only a few minutes to get wrinkle free dress shirts.

how's it going?

Damn, me too... ;)

Depends on ambient temperature and time on saddle. I live in a tropical country. More than 30 minutes of saddle time, one is going to sweat even if temperature is 18 deg Celsius with a breeze and the cycling pace is 12-15kmph. I enter my office drenched in 32-33 deg C weather and wipe off the sweat in restroom with a towel.

Are you sure....I have a lot of energy while pedalling to office and still left with some more to do the work that earns my bread. However I feel a little bit tired while commuting back, maybe the sedentary nature of the job is to be blamed.

****ing grease on my ****ing suit pant leg again. **** me!