Snake sightings could increase after rainy weather in San Antonio-area How to tell if snake is venomous Updated: Tags: SAN ANTONIO – Heavy rains in the San Antonio-area overnight could cause a spike in snake sightings. Snakes, historically, like to come out after rainstorms. “The rain is known to bring the snakes out since they will be chasing after frogs,” and other prey, according to Snake-Removal.com. Snakes also seek higher ground and shelter from the rain, which means they could show up in your house or neighborhood. What can you do? Keep storage areas, such as your garage or shed, as clean and tidy as possible. Snakes can fit through tiny openings and easily hide in shadowy areas which means wood and brush piles should be kept as far away from your residence as possible.