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Humidity shouldn't hurt modern ammunition in any major way. It will have a *very* small impact on the burn rate of the powder, but won't matter unless you are shooting for gnats ass precision.
More commonly rounds go bad from excessive loading/unloading in an automatic pistol. If you are constantly chambering one round over and over it may slowly push the bullet back into the cartridge which will greatly increase chamber pressures when it is finally fired.
Solvent/Gun Oil is another concern, but unless you saturate the primer area with oil you are not likely to experience this.
Immersion will get to most cheap ammunition. Premium ammunition typically is less susceptible to this short-term.
I would imagine extreme heat could play a role, but I have shot ammunition that has spent years sitting in a shipping container in Afghanistan with no problems.
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