I don’t know your personal experience and how dangerous it was in regards to temperature, but high temperature environments start feeling pretty humid at like ~50%, so you still pretty much need an actual temperature/humidity reading to gauge it correctly.
So guys, take it to the scientists :) I’m not talking out of my ass here, rather quoting research data. There are a couple dozen papers listed in the link above, and most seem to agree on the dangerous temp region. Read their methodology and reasoning if you’re interested to learn more.