When is coolant temp too hot. About 216

I would not even start to worry until one of two things happen

A The cap starts puking coolant

B you get OVER 230

I admit, I'd prefer it run a little cooler, but 104 OD temps are getting "up there." Even humidity plays a role. While high humidity makes humans feel hot, the fact is that high humidity HELPS vehicles transfer heat. (Humid air can hold more heat than dry air, especially hot dry air, and especially high altitude, thin, dry, air.)