I would not suggest guessing. My hand is currently reading 101ºF 80º hot spot to me now doesn't feel very warm. I would NEVER bath at 80º on purpose swim sure but tub no way. Luke warm will not feel the same all the time to every person. If you are cold it is cooler warm warmer. Don't guess temps. IR guns are great tools but understanding the limitations is important they cannot accurately measure translucent surfaces like air and water.