Water temperature when washing dishes should be very hot. Try to get the water hot enough so that it is uncomfortable for your bare hands to be submerged for very long. Your hands probably can't tolerate water over 110-115 degrees. To help you use the hottest water possible,try wearing dishwashing gloves. They will protect your hands and allow you to use water at the proper temperature. Remember to change your water when it becomes dirty and cold.
Water temperature when rinsing dishes is just as important. Rinsing water will ideally be around 170 degrees. This temperature insures that dishes will air dry quickly reducing streaks and spots. 4 Reasons to Wash and Rinse Dishes in Hot Water
Washing dishes by hand is good for your mental health. If you do it mindfully, it can lower stress, according to a study published in 2015.