Here in Seattle we don't get a lot of hot (or even warm) weather. There's not much humidity year round & it's often damp with overcast skies. Normally, I love the feel & tone of my bass, but I noticed on days when the temp hits the high 70s or beyond, I'm having to tighten my strings much more to get a correct reading from my Korg e-tuner. I play a few year old Yamaha/N89 with a rosewood FB on maple neck. I keep it out on a stand in the corner of the room for constant access, but away from any sunlight. I'm wondering if this is a common problem with basses?