Honestly? It depends on the bench, the amount of water, and what you're wearing. I've sat on a damp-looking bench and walked away with a giant wet patch, and I've also sat on a lightly misted plastic bench with zero problems. So let me give you the real answer.
First, check the material. Wooden benches are the sneaky ones. Raw or slightly worn wood soaks up water like a sponge. When you put your body weight on it, that water gets squeezed to the surface and into your pants. Metal benches don't absorb water, but they collect droplets and can feel cold and wet almost immediately. Plastic or composite benches are the safest; water usually beads up on top and can be wiped away quickly.
Second, look at how wet it actually is. If there's standing water, visible droplets, or a shiny film, your pants will almost certainly get wet. If it's just a light mist or morning dew, you might get away with a quick hand wipe and a short sit. A simple trick is to press your hand firmly on the bench for about ten seconds. If your hand comes up damp, your pants will soak that up too.
Third, consider your pants. Thin cotton, linen, and lightweight joggers show moisture fast and hold it. Denim gives you a little more protection, but once it gets wet, it stays cold and heavy. Water-resistant or quick-dry pants are your best friend on damp days.
If you really need to sit, here's what to do: wipe the bench with a paper towel, napkin, or even a dry part of your sleeve. Then put down a plastic bag, a jacket, a newspaper, or a folded scarf. Sit on the edge with minimal contact if you're still unsure. That way, even if the bench is wet, you won't end up with soaked pants.
So, will it soak your pants? If water transfers to your hand during the press test, yes, it will transfer to your pants. But with a quick wipe and a barrier, you can usually sit safely. When in doubt, stay standing — your dry pants will thank you.