It means we have to wash and change about 10 times in one day!! Basicaly, you have summed it up! Even if the sun is out, and even if it shud rain, your body will bang out 96% of sweat!!!
96% is the relative humidity.
That means the air about us is holding 96% of the water vapour it would need to become completely saturated.
Thats why you can usually stand hotter conditions in a place like Spain better than you can in Britain. The relative humidity is lower.
Its also why the dew falls when night comes. The colder air cant hold the moisture and it condenses.