A widespread cause for Pothos’ leaves sweating is high humidity. Guttation most often occurs when there is a sudden drop or rise in moisture levels in the air.
When you overwater your plant, you give it more moisture than it can absorb. The roots will try to deliver the water to the foliage, which creates pressure on the leaves and roots.
Like humans, Pothos will increase its moisture excretion in response to high temperatures. They do this to cool down.