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Which Bugs Come Out When It Rains?

Certain pests are attracted to moisture and may enter your home on rainy days. Protect yourself from bugs with Brooks Pest Control.

Dealing with bugs around your home or place of business can often be a year-round battle. Several remedies and treatments exist to fight back against these pesky pests, but it seems that no matter what you do, they almost always return.

While many bugs are almost always looking for a way to get indoors, this is especially the case after it rains. Insects are quite similar to humans in that they don’t like getting caught in a rainstorm, though they can’t simply grab an umbrella or pull up their hood like we can. As such, you may find yourself frequently wondering, “Do bugs go out in the rain?”

Believe it or not, they do! While they don’t put on colorful plastic ponchos like us, bugs travel through rain quite often. When it starts to pour, they’re frequently forced to abandon their nests and seek out a new, dryer place to live—which may be inside your home. If that’s not enough, the wet conditions outside also mean that a wave of moisture-loving bugs is creeping out of hiding behind them and quickly reproducing.

The most effective way to protect your home or business from bugs is to use professional pest control treatments like the ones offered by Brooks Pest Control, but there are other ways to stay prepared. It’s crucial to stay informed as to what insects come out when it rains and how you can maintain your property to prevent them from being a bigger problem than they need to be.

Bugs That Come Out After Rain


Ants are one of the most commonly found bugs outside of homes and businesses, particularly after long stretches of wet weather. If you see them milling around often, it can be natural to ask yourself, “Why do ants come indoors when it rains?”

Essentially, during prolonged periods of rainfall, these little insects are flushed out of their colonies in the ground and have to find a new place to nest. This often leads them inside, as their main pursuit is somewhere dry near a source of food. Seal all potential points of entry, maintain clean surroundings, and set store-bought traps if you find the early stages of an ant problem.


A close-up image of a mosquito sitting on a raindrop-covered leaf.

Arguably the most dangerous (and bothersome) insect you can spot around your home or business after a storm is the dreaded mosquito. These infamous airborne bugs are small, but they can easily spread harmful diseases and viruses. It feels like they come out of nowhere in these moments, you may be wondering, “Are mosquitoes worse in rain?”

In short, yes and no. Mosquitoes don’t necessarily love the rain itself but rather what it leaves behind: rich deposits of standing water, perfect for laying eggs. Whether in something as big as a pond or as small as a puddle on the sidewalk, mosquitoes reproduce like crazy after storms, especially when it’s also warm and humid. This problem is only amplified when it rains for days in a row, as it spawns multiple generations of annoying pests that can be hard to get rid of.


Not many bugs are more startling to find indoors than cockroaches. They’re easy to step on, smack, or otherwise squash, but you may find yourself wondering how cockroaches get inside. When it rains, roaches have to either find cover or relocate altogether—and they often choose to head indoors. They also may be forced up into your home through drains and around unsealed pipes.


A photograph of a spider at the center of a large, complex web

You can find spiders in your home or business at any time of year, but they’re particularly likely to sneak indoors during a rainstorm. Spiders like warmth, and it usually gets too chilly for them outdoors when it rains. This drives them inside, where they also often find abundant prey in the form of other small insects. And once they’ve discovered warmth, shelter, and food inside your walls, they’re not exactly going to want to leave.

Centipedes and Millipedes

Centipedes actually enjoy rain in moderation, as they need constant moisture to survive. Heavy showers or prolonged storms can be too much for these creepy-looking bugs, however, which can cause them to crawl inside. Much like spiders, they feast on smaller insects and will decide to stick around if they can find a steady source of prey, primarily around showers, sinks, and other moisture-rich areas.

Things To Remember About Pest Protection

Out of all the ways to protect your home or business from bugs, the easiest approach is to simply be proactive. Examine the exterior and interior of your home and seal off any spots where insects may be getting in. Maintain a clean environment by cleaning up spills, crumbs, and trash and keeping human food and pet food containers closed and organized. If you have trees, bushes, or other foliage, make sure it’s all neatly trimmed and not too close to any walls.

Get Help From the Experts at Brooks Pest Control

If you’ve discovered a bug problem that’s too much to handle on your own, call in the experts at Brooks Pest Control. We offer affordable pest control services in California, Oregon, and Washington that are a quick and thorough way to get rid of ants, mosquitoes, cockroaches, and more. Our treatments are eco-friendly and approved to be around kids and pets, so you’ll know you’re getting the best service when working with us.

Contact us online or give us a call if you have any further questions or would like to set up a visit. Same day service is available if you call before noon. You can also get a free quote on pest control services and explore our special offers page to find ways to save!