AJ
Take a look at Supco's Data loggers, you can log down to 1 sec interval. I have a bunch of them: Temp & RH/ Vots & Amps/ Temp & Press/ Two point temp. Look for Logit (2 Ch)series or SLC 2 series (1 Ch, temp only).
The run on 9-pin serial interface if you can only run them with USB then get a serial 9 to USB adapter from Radio Shack.