Today is a really humid day. The temperature isn't really that

hot, but as soon as you step outside you start to sweat and your clothes stick to you.

There are many ways to say humid in English:
1) Muggy
2) Sticky
3) Stuffy
4) Sweltering
5) Stifling
6) Steamy
7) Swampy

One of my favorite phrases during hot summer is "swamp ass." This term refers to having a very sweaty butt 😄😄😄😄.

When you are outside in humid weather you often get swamp ass. It makes your underwear and pants wet with sweat.

Note: Swamp ass is slang and can be offensive or gross. It shouldn't be used around children or people that are easily offended.