>This might seen a little bit weird but I need to know where to go on the net to get the weather on September 9, 2001. Anyone would know a site that allows us to get the archive on a specific day?

Is there a location you need the weather for?

Here is a USA weather map for that day - alhough I'm guessing that does you no good at all...

http://www.njaudubon.org/Education/Oases/Project/Schools/Lesson5maps.pdf