(I hope these links work)Click on your state, then the city you are closest to. It will give viewing information. For locations outside the US and territories, use the NASA Skywatch link here http://spaceflight.nasa.gov/realdata/sightings/SSapplications/Post/JavaSSOP/JavaSSOP.html
I have observed that the times of duration of sightings here in Huntsville are actually longer than listed, so it is worth it to try even the short duration flyovers. I suppose it depends on where you are viewing and how far your location is from that posted on the website. Best location would be a high spot with low light and no trees or buildings to block your view. ISS has a magnitude of something like -4.5 or more (very bright), so it it quite bright. However, the moon might make it appear dimmer these next few nights. If you point yourself in the general direction of approach and scan the sky, you will see it pop into view. It moves along at a pretty good clip, but you will usually have time to spot it before departure when it will usually diminish in size and then just wink out.
It's cool. Give it a try. If your night sky is too light, try driving a few miles away from urban locations and see if the dark sky quality improves. Pack some snacks, lawn chairs, and take a friend or a few. Have a sky party.