Going swimming in 40 C° hot water is rather dangerous. That’s the maximum safe temperature for a hot tub that you sit in for 10-15 minutes. It’s above body temp

Going swimming in 40 C° hot water is rather dangerous. That’s the maximum safe temperature for a hot tub that you sit in for 10-15 minutes. It’s above body temperature and will prevent your body from cooling. A comfortable temperature for swimming is around 30 degrees, lower in summer.