Humidity is exactly what roaches are looking for.

Cockroaches don't just tolerate humidity — they need it. Most roach species lose water quickly through their exoskeletons and have to stay near moisture sources to survive, which is exactly why summer in a humid coastal region like Hampton Roads tends to bring a noticeable uptick in activity.

The species behind most local activity

Two species account for most residential roach calls in this region, and they behave differently:

• German cockroaches — small, light brown, and the most common indoor infestation. They reproduce quickly and tend to concentrate in kitchens and bathrooms, wherever moisture and food are both available.
• American cockroaches — larger, reddish-brown, and especially prevalent in Hampton Roads and the broader Tidewater region. These are often called "sewer roaches" because they commonly enter through drain lines, foundation cracks, and sewer connections — a route that's more available in older coastal infrastructure than in drier inland areas.

Why summer humidity makes it worse

High humidity does two things that work against homeowners: it keeps roaches active and hydrated for longer stretches, and it makes the indoors — with air conditioning creating a humidity contrast — an appealing destination when outdoor conditions get uncomfortably hot. Combine that with the increased likelihood of food debris and moisture around kitchens during summer entertaining season, and it's a predictable seasonal pattern, not bad luck.

What actually helps

• Address moisture sources — fix slow leaks, wipe down sink areas, and keep humidity-prone areas like bathrooms and laundry rooms as dry as practical
• Target harborage, not just sightings — behind refrigerators, under sinks, and inside wall voids matter more than the spot where you saw one
• Seal likely entry points, particularly around drain lines and foundation cracks common to American cockroach entry
• Use targeted bait and residual treatment rather than broadcast spraying, which tends to scatter a population rather than eliminate it — sometimes making the problem harder to fully resolve afterward

DIY sprays are especially prone to this scattering effect with roaches specifically, which is part of why professional treatment tends to outperform store-bought products for anything beyond an isolated sighting.