I have a shed with a front porch and roof cover (5x8 feet). I plan to put an interior door at the shed wall but under this cover area. Is it OK? This won't be soaking wet. It will be slightly wet if rain with strong wind. I am guessing an interior door hollow core can stand lightly wet once in awhile and cold/hot temperature for at least few years. Let me know if you have a different take?!
Interior doors definitely do not work. I tried them with 3/8 exterior plywood covering the outer surface of the doors and they still fell apart in a few years.
If it's a hollow core, then no, it won't be okay.
A solid core or panel door of some kind will be okay for a while, but you'll get the longest life out of an exterior grade door.