Will crabs come out when it rains?

No, crabs don't come out when it rains, and they also hide from the rain. After the heavy rain, the crab climbed out of the hole for air, so it didn't come out when it rained. The timing of releasing crab cages is generally on the full moon every month, or when it rains according to the weather forecast, and when the tide ebbs after the rain, many crabs will be harvested.