system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If my body temperature is 98.6F and it's only 80 outside, why am I sweating? I'm always warmer than that!
gpt
It's because just to stay alive, your body is always producing heat. If this heat just builds up in the body and particularly the internal organs, you could get hurt. 

When you're in surroundings colder than your body, it's quite easy for that heat to leave the body at a pace that keeps your temperature stable and safe. When your surroundings get closer to being as warm as your body (or when you start producing extra heat by being physically active), you need to help the process along by sweating. The excess heat can then be used to evaporate sweat instead of raising your internal temperature.