USB requires a host. The PIC using the on-board USB or a USART to USB interface, and your temperature sensors are not capable of doing this. The VNC2 that Darrel linked to looks like it might work for your application though.
They even have precompiled rom's available. This one looks like it will do what you need, it is a USB host bridged to a UART port.
http://www.ftdichip.com/Support/Docu...ost_Bridge.pdf
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