system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do we feel uncomfortable in hot weather, but feel comfortable in hot water (shower, hot tub, etc.)?

The title says it all.
gpt
What matters is not the temperature, but how fast heat is leaving your body. Air is not that good at taking heat away, so at around 27 degrees Celsius there comes a point where you can't get rid of your body heat as fast as it builds up without some other strategy, like sweating.

If the air is moving, it is better at removing heat, so it "feels" colder. Water is much much better at removing heat then air so the comfortable temperature is closer to your internal body temp, somewhere around 33 degrees.