Hi TH,
Thanks for reaching out! - The info fro AgNeSeSaP is spot on, we typically recommend bringing some extra layers and a pair of gloves just in case, our shop provides free raingear. If not sure about the weather, the best bet would be to check the forecast and make that decision about 2 days out (our booking refund window)
If you have any questions please also feel free to toss us an email.
Regards,
- Evan @ Cycle Portland