It is normal for the pulley and alternator to get hot to the touch during normal operation.
If you have access to a long screwdriver, or something similar, you can touch one end to each of the accessories (alternator. A/C compressor, power steering pump, etc) and hold the other end to your ear, and use it as a mechanics stethoscope. Any unusual sounds that the accessories are making should transfer through the screwdriver, and it may help diagnose where the noise is coming from.
Be very careful to not get your hair or any loose clothing, etc. caught in the belt and pulleys!
Also, check to make sure that all of the pulleys on the accessories look like they are all aligned with each other.
I have the same problem with my truck. The belt squeaks during cool damp weather, but stops as soon as everything warms up underneath the hood. It doesn't squeak at all during the warm months. I've done everything possible to remedy the problem, but it still persists. I've decided to just live with it.