The water temperature has to be above 95°F-104°F (35°C - 40°C) to be classified as a Hot Spring. This is not a random value but what is considered body temperature. So a hot spring has temperatures between 40°C and boiling point.
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Many accommodations in Hot Springs have fireplaces and, in winter, they are toasty and very inviting. The hot mineral springs are open year-round and, with water temperatures of 102-103 degrees, a soak in the springs is great even in the coldest of weather.
A hot spring is an all-natural body of water that is warmed geothermally. One way to classify a hot spring is that it must be well above the temperature of the surrounding earth, and usually hot springs hover around the 100 degrees Fahrenheit mark.
Taking a DipThe naturally high temperatures of the spring water make the water unsafe for bathing, so think twice before you dip your toes in. Fortunately, there are other options at the park that make it possible to submerse yourself in the therapeutic waters at a safe temperature.
They will list the current temperature of the water as well as the maximum amount of minutes to stay in at a time. For the most part, almost all commercial hot springs in North America require swimsuits so always err on the side of caution and keep that suit on. Even if you see someone remove their suit – wait.
It's best not to eat before bathing in the onsen, but you need to drink a lot of water before and after your onsen bath. Keep your bath to a minimum. Staying too long may cause dehydration. While an onsen is relaxing and beneficial to your health, it's generally not a good idea to enter more than three times a day.