assuming it’s not horrible like a blizzard or heatwave, would a warforged be comfortable spending all day in the elements like a light drizzle? Alternatively; are my players justified in forcing the warforged out of the camping tent to get themselves more room? I don't think that a mild drizzle would have any adverse effects on a warforged. Precise immunities vary by edition, but in both 3.5 and 5E warforged are immune to disease, so you can't get sick due to exposure to the elements.
— Keith Baker (@HellcowKeith) January 26, 2019
Would they feel discomfort though? Like me forcing my friend out into a chilly day won’t kill him, but it’s a dick move. Personally, I don't think so. The "muscles" of a warforged are basically tree roots; does a tree mind being rained on? Beyond that, if warforged were bothered by rain or cold, they'd presumably wear clothes to deal with this… and we don't show them wearing clothes.
— Keith Baker (@HellcowKeith) January 26, 2019
A SPECIFIC warforged could develop a problem with this as a quirk, but I've always seen warforged as extremely stoic and not likely to be bothered by minor discomfort.
— Keith Baker (@HellcowKeith) January 26, 2019