There's a series of good ISS passes for the eastern US over the next few days, and good weather for watching. Here's the table of passes for Boston
(times are EDT local). These will be approximately correct for most of New England, but you can also go to the heavens-above homepage and set a different location. Look for a large "Highest Point Alt" (90 deg is max) and a more negative "Brightness."
Tonight's pass is less ideal, although it does have the bonus of watching ISS go into shadow and magically disappear at 8:51 PM local time:
Tonight's pass is better the farther south and west you are - e.g. D.C.
Tomorrow (Friday) night's pass just after 8 PM will be excellent - almost directly overhead:
There's another good one on Monday night, Sep 23, with a second lower altitude pass 90 mins later. The first pass will be in bright twilight, but at -3.5 mag should be visible.