Does rain count as me watering, or a visitor watering?

In Animal Crossing New Horizons, I understand that rain waters all flowers on the island. However, there’s a mechanic where folks visiting your island who water your flowers can have the waterings stack to be more effective than just me watering alone.

My question is does rain count as me watering the flowers, or a visitor watering? Do I get more of an effect by watering while it’s raining?