Beginner roller skating
Everyone Says Slow Down in the Rain. Nobody Says Push Softer.
The wheel that slips out on wet ground is usually not the one you're rolling on, it's the one you just shoved off with. A hard push loads a wheel sideways for a fraction of a second, and sideways is exactly what wet ground won't give you. So the wet-weather change isn't only your speed, it's your stride: shorter, softer, more of them. You'll feel slow doing it. You will also still be standing.
Everyone knows to slow down in the rain. Far fewer people are told the other half, which is arguably the more useful one: avoid pushing hard.
The wheel that slips out on wet ground is usually not the one you are rolling on. It is the one you just shoved off with. A hard push loads a wheel sideways for a fraction of a second, and sideways is precisely what a wet surface will not give you.
These are two separate instructions and it is worth keeping them separate. Speed is what you end up carrying; the push is something you actively do. You can be going slowly and still put yourself down with one impatient stride.
So the wet-weather change is to your stride, not only to your pace: shorter, softer, more of them. It feels slow and inefficient. You will also still be standing at the end of it.
Keep going: this is one section of the full Roller Skating for Beginners guide — sizing, gear, stopping, and where to skate, in one page.