Hello Fiona,
To answer your questions:
-Great news! It's because someone told us you couldn't do it in January? But I am guessing that's not true? Yes, it is not true. The Inca trail is closed in Februar, open in January.
- Is the weather okay for the inca trail in Jan? It is the rainy season. It rains everyday.
Do you think we would be safe to book it once we get to Peru? - I don't know. You can just check availability when it opens so you can see the evolution of spaces being sold.
Kind regards,