The EpiPen cases aren't sealed by any means... They let in moisture. Auvi-Q units are supposed to be water resistant o some degree as well. Either way, a heavy duty (freezer) zip top bag has kept my autoinjectors dry in damp conditions, rain, and inside a Frio. I wouldn't submerge it under water that way, but for general use (and my active outdoor lifestyle), zip top bags have worked well day-to-day for a least ten years.
Keeping them in a pants pocket will almost always push them over the ideal storage temperatures, so I wouldn't be too concerned with 82F. Keep them in a backpack or in the shade and it should be fine.
Granted, I am no medical expert here, just sharing my experience.