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ant on a branch in the rain

Why Do Pests Come Out After It Rains?

Do you feel like you see an increase in pest problems around your property following “April showers” and summer storms? It’s not your imagination. Rainfall can have a noticeable effect on bugs’ behavior. However, the reason for those behavior changes varies from bug to bug.


Here are some common reasons why pest activity increases following rain.

1. Their homes were flooded.

This is a very common problem with ants. Many ants that typically invade American homes nest underground. Consequently, when there’s rain, water will fill up the ants’ underground nests and drive them out.

Unfortunately, while seeking shelter, ants may find their way into your home and happen upon a food source (like a bag of cookies that wasn’t properly sealed shut). This can result in ants overstaying their welcome and creating a satellite colony in your home.

During rain, cockroaches can also get “flooded out” of areas they typically inhabit, like sewer and drain systems. Some cockroaches will even crawl up through residential drains right into kitchens and bathrooms!

2. It’s the perfect weather for “swarming.”

Wood-destroying insects, like termites and carpenter ants, typically swarm on warm, sunny days following rain during spring and summer. Swarming termites and carpenter ants are winged members of their colonies. Their “job” is to mate and find locations to start new colonies.

So why do they swarm on a day following rain? Rain makes the insects’ environment moister, which increases their chance of survival. Additionally, wet, dirty, and soggy wood is much easier to chew up and tunnel inside.

3. They’re looking for other bugs to eat.

Because rain causes many types of bugs to emerge, predatory bugs will come out of the woodwork looking for a meal. Two prominent examples are mites and centipedes. These creepy-crawlies know that there will be plenty of prey to choose from following rain, so you may see an unusual number of these bugs around your home.

4. Rain creates ideal egg-laying conditions.

Mosquitoes must lay their eggs on standing water (or right next to it, depending on the species). Rainfall provides the perfect opportunity to lay some eggs. This is why you can see giant swarms of mosquitoes around stagnant ponds and puddles after a rainy day.

Do you need help with a pest issue in your home? Call the pest control experts at Hoffman's Exterminating Co., Inc. today: (800) 615-3920!