Bathroom Stinks?????

Vabuilder

there could also be some mold/rot buildup behind the wall of the toilet. I have seen it many times when the re-do wasn't done by a pro. also seen it done a few times by pro-s. on dry days the mold will not be as strong as on humid days. may be worth pulling the drywall around the toilet and checking it out.

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Double-A

What does it smell like? Flatulence, urine or mold?

Flatulence is likely a trap not holding a proper water seal, a bad wax seal or a bacteria in the toilet rim and waterways introduced from a sewer back up in the past.

Urine will be from poor aim/housekeeping or pets/pests.

Mold is the hardest to find and fix. Suspect shower first, but look under sink at sheet rock around drains and supply lines and at the supply line to the toilet. Don't forget to check the tub spout, shower arm and packing nuts on the tub valve.

Since you notice this smell mostly on hot humid days, my money is on mold.

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New York Times, July 20, 2006