I think a lot of folks worry too much about this. If you don't get a lot of sub 35% days, just don't sweat it. I never keep my instruments in cases, I never humidify, I don't worry when taking ukes on the road unless it's going to be ridiculously dry. Sure, there are situations that are bad, but a good instrument made with properly dried wood should be OK in Vancouver.
As was said, the best bang for the buck would be a humidity meter so you actually know what is going on.
For a nice uke like that you should really spend the $27 to be able to monitor the room's humidity. As Chuck said, the humidity inside can be very different than outside if you run a furnace or AC. Here's a hygrometer that's nice:
http://elderly.com/accessories/items/OGH2.htm
Hope this helps