Taking hot showers

I'm 6 weeks and know hot tubs and hot baths are a no no. I try to keep my shower cooler than I used to but still sometimes get out and feel "hot" and then worry maybe it was too hot? How do I gauge it? I've heard 100 degrees or less but I don't have anything that measures degrees so I'm just guessing. Of course when you feel sick, tired and worried a hot shower is so welcoming so it's hard to keep it cooler. What is your take on this?