There are several main reasons why you can see snails after it rains:

1. After it rains, the snail's nest will be filled with water. If the snail remains in the soil, it will not be able to breathe, so you will see snails after it rains.

2. After it rains, the leaves of plants are soaked in rain and will rot faster. The smell emitted by the leaves at this time is very attractive to snails and will also stimulate their appetite, so the snails will come out after it rains. Foraging.

3. Rainwater will wash away the soil. The mass of snails is very small. As long as the rainwater is slightly heavier, all the snails can be washed out. Therefore, when it rains, you can see many snails walking on the road, which may be washed out by the rain.