Hi & welcome @Choco14
The Charge 5 monitors the your skin temperature while you're asleep. However, the data recorded is variation from your baseline, not your actual skin temperature, and can be found in the Health Metrics tab in your app. If you're looking for what your skin temperature is, that's not data that your Charge 5 provides.
I hope this answers your question. If not, please let us know so we can help.
Rieko | N California USA MBG PE