Your temperature changes when exercising
Your body temperature increases during exercise because the heat comes out when your muscles start to create energy. 
As your temperature rises, your body activates mechanisms to keep the core temperature at a safe level. Also, sweating is another way to cool down the body. 
Your ability to regulate your temperature during exercise depends on numerous different factors such as:
-Individual acclimatisation 
-Your hydration level 
-Genetics and many more factors 
While talking about hydration level. We should remind you that your hydration level is one of the most important to keep in balance while exercising. 
Drinking water before, during and after your workout will boost your energy levels, and will enable you to regulate your temperature.